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Dave42 last won the day on May 2

Dave42 had the most liked content!

Previous Fields

  • Car Model and Year
    2002 SEVILLE STS
  • Engine
    Northstar 4.6L V8 (LD8/L37)

Dave42's Achievements


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  1. To explain after ordering the KentMOORE I GOT STICKER SHOCK
  2. I do not speak swedish but I think you may be asking if another TPS sensor will work on the Northstar STS motor the answer is yes the buick 4.6L has a different TPS sensor available from Bosch and Standard companies the direction the wires are facing is different electrically same.
  3. Logan is dead correct Being that it is a 2017 rather than new it is probably a lease return vehicle or a service fleet vehicle. Some dealers required these for internal lease and some lenders used this as well. Also Progressive and another insurance company often put these in for a discount. If you own the vehicle take the dongle out As far as the codes read the section on OnStar https://my.chevrolet.com/content/dam/gmownercenter/gmna/dynamic/manuals/2017/Chevrolet/Suburban/2017-chevrolet-tahoe-suburban-owners-manual.pdf page 441 You can follow the instructions to get an email message of the issues while on the trial period since you bought from dealer OnStar trial is part of standard marketing package you paid for.
  4. Hi guys sorry for not noticing this post before tonight. I have the unique privilege of having built a custom Art car from a retired police car. The B -Body and G body are essentially the same chassis with and extra 10inches of length added behind the drivers seat. I used a complete harness and all amenities from the Fleetwood in the Caprice. So I have run through the entire harness and merged. That power drain of 5mA is the delayed accessory buss controller pull the module and check again. However it never caused a battery drop below 11 volts for me so I always started. I was using a Optima Red that is kind of like a battery backup battery in it's discharge curve. If you had 8VAC on the battery during running there was probably a drain through the same bad diode module not measured. The cop cars came with a larger 138A alternator and a different drivers side bracket to support the big alternator with the heated front windshield option for the L91 caprice this bracket and alternator can be had from dealer as recent as monday a week ago. It uses a longer belt as well I installed one on my suburban. Also that noise in the AC is called slugging I worked for PRO at that time and we had hundreds of complaints but just replaced the compressors during the warranty rather than issue a bulletin. What the issue is , there are two versions of the R4/R11 compressor the R11 has about 50% more displacement but physically the same size. The larger evaporator on the Fleetwood and second Rear AC on Escalade and Suburban causes liquid to be present on the suction side of the compressor when using a R4 in place of an R11. Hense slugging and compressor failure. If you have the noise then you have a couple of options On g-Body you can swap out the evaporator with a B-body on the GMT400 Escalade and Suburban they went to a Sankyo compressor in 1996 junk yarding can find the complete bracket set , hoses and pulleys for about $150 the Compressor for 60 on amazon
  5. Another aspect of using the water methanol injection method of detonation protection is the amount of time that it takes for the water to evap drawing down the heat of the combustion charge. on a twin turbo ford 5L I built a few years ago I found that the sweet spot for the extra injectors was 19inches from the back of the intake valves. So that gives me a good volume reference to use on this build. I was pulling 1048 HP at the flywheel on the Ford. This build I am going for a clean 700Hp. Another aspect is this is a fun project and when complete be sold as is for someone else to continue with. I have another much faster car I have owned since 1997 in the garage waiting. In Florida we do not have emissions testing but it is illegal to sell emissions disabled vehicles for on road use. This aspect is handled in two ways either the car is purchased as a auto rally race car as is or I can OEM the car rebrand it as a sports vehicle and provide affidavit of compliance and safety. Since the later is expensive and the audience for buying a car like this unlikely to be a non-motorhead or a purist. But a motor sports enthusiast so I will be selling it as a race car. Once you won it you can do what ever you like. Back during the horrible Lawton Childs occupation I placed new vin numbers and OEM registrations on more than 200 vehicles that had been built by local custom shops that could not pass emissions testing. It was later ruled in court that the State required testing was being conducted by a fraudulent company that had been thrown out of NY and paid officials in FL to enact policy that required their fraud. This ended with the state of Florida having to refund all of the fines and testing fees collected over an 8 year period. Most people came to Florida during this time and had to pay an additional $400 tag fee for out of state transfers that in itself is a Constitutional violation and punishable under USC title 18 242. SO after all that disclaimer I am placing a 3in Down pipe and 52 inch straight pipe then a small resonator and out to the two stock muffler tips. The resonator tends to prevent the flame shooting out from the exhaust. The sound is much loader than convention but not audible in car and passes the 85DB requirement at 35ft. Sounds more like a deep rushing sound than a pulse note.
  6. This staged method allows use of smaller fast start turbo to produce pressure off idle to about 2800 rpm giving time for the second larger turbo to spin up and carry out to 9000RPM the two turbos are actually smaller than a T70 that would be good from 3000 to 9000. But there is little or no turbo lag or steep boost transitions. I did some thing similar on a BMW 633 with a 3.5L and one 1L and one 4L sized turbo. The transmission will handle the added torque and RPm no problem but I will be putting another cooler farther back in the car due to the high likely hood of very high front pump pressure. I already experienced the in radiator trans cooler failure and placed a new transaxle a couple of years ago. I put a Large Aluminum TANKED RADIATOR IN AT THAT TIME. I am still determining the location of an intercooler I might go ahead and put a cowl induction style scoop on the hood and dump the heat out the top rather than put it before the radiator there might also be enough room to place the intercooler between the trans axle and fire wall and duct it down.
  7. So today I was doing some calculations on the upcoming engine build. I have a desire to avoid using 100 octane or 110 because of the price. I am looking at limiting the effective compression to 13:1 and using water ethanol mix to suppress the charge temperature further so that the initial combustion temp is under 760 avoiding ping. I am thinking of setting up a sequential turbo so I do not have a steep slope on the power band. Small 1.8 2.5 L .63 Trim VW turbos are less than $150 while the larger GT45 are under $200. I found the exhaust manifold flanges. This guy has them for $50 http://www.vendio.com/stores/JAYNIMMO/item/racing-parts-exhaust/cadillac-northstar-v-8-header-/lid=2555777 I am most likely going to use a trick I know to use scavenge fuel pulse waste spark to keep the exhaust lit in the manifold increasing and maintaining turbine speeds. This requires some heavy gauge header pipe to avoid burn through. I have used RIGID electrical conduit for this in the past it works fine you have to soak in muriatic acid to remove the galvanizing, weld it then bake it in a kitchen oven at 575 for an hour. Take out put in a box with damp rid until cool to touch. Spray bomb the whole thing with rustoleum 2000 degree then while still wet put back in oven at 190 for two hours ,take wife to dinner when you get home turn the oven up to 575 again. This removes any chance of cracking and gives a durable finish inside and out. This will cure out on the car over a couple of hard pulls you need to wrap the whole thing in titanium heat web header wrap. They last longer than most stainless headers and cost is cheap. So I am placing the turbos in the drivers side forward removing the air cleaner housing the hot side tube routing will be front to back then two turbos at the crossover. The small turbo feeds the big one through the waste gate and turbo outlet combined. One half the GT45 turbine is fed from this pipe the other is fed from a second waste gate set at 2.5lbs of exhaust pressure looking at the GT45 it is set up with two turbine stator housings and inlets one outlet. So little turbo with big waste gate set to 6psi intake pressure turbine outlet into one half of GT45, Second waste gate on crossover pipe feeds second turbine on GT45. Inlet of small turbo draws from air box. Outlet of small turbo blows into second half of air box, Inlet of second turbo draws from second half of air box air box has a plate reed valve set at one psi vacuum that separates the two sides.
  8. Flipped the car around and got distracted with another motor build finished up Wednesday. It was pretty fun the guy has a 1977 lasaber with a 1950s style Mexican tuck and roll leather interior completely in purple with white stitching not my style but absolutely beautiful. The tear down on his junk yard motor revealed a 1980s top of the line 355 build. 2256 pistons lightened rods ,internally balanced rotating assembly, old big valve smog heads. Measuring it was great everything was done to the style in 1984. Back at that time I raced Nascar and some of the old tricks have been done to this motor. To lower rotating stiction and friction top builders would bore the cylinders with a few thousands taper tight on top of stroke loose on bottom. The block was decked down allowing the top land of the piston to be out of cylinder by .030in then they used old perma torque .070 gaskets to space the quench area perfect. Cam bearing journels on the center three had been oversized to true a shifted cam bore after the cylinders had moved with seasoning. Four bolt mains non splayed steel caps. Pan skirt milled down .025 for old style block girdle. Screw in rear cam plug pinned freeze out plugs. The heads are smog heads with 119cc chambers un relieved intake ports not matched, bronze sleeved instead of bronze guides. oring seals no umbrellas. I built the motor back a little different. I chamfered and cross drilled the crank oil holes, Fit Total Seal Zero gap secondaries and Ductile top rings pistons and block only needed minor cleanup. I used a .040 stainless ringed graphite head gasket. Heads I milled down the valve guides for modern teflon silicon seals and to allow larger lift. Cleaned up the shortside radius on intake and exhaust ports, tear dropped the guide bosses in pocket, ground a tulip on the valve head to stem transition. Cleaned all of the sharp edges out of the combustion chambers and unshrouded the valve to pocket to 5/16 all around. Matched the gasket on the intake ports opened up the pushrod holes to 7/16 holes, removed the 3/8 studs and installed 7/16 with stainless cast 1.6 roller rockers. Valve springs open at 380LBS closed at 200lbs. Set a Stage 3 cam .496 lift 305/290 duration 108 at 103 centerline. Motor sounds solid should make 375HP at the wheel. I will post a video on starting it on the floor.
  9. Can you please measure the tool that holds the cam shafts ? I will cut a couple on the mill and draw it for wasser laser cutter so others can get ahold of one the Kentmore engine tool kits are pretty steeply priced.
  10. Hey Jan
    I have a friend in his 80s with a 81 Eldorado Barritz his mechanic swapped out the computer loosing the memcal chips any chance you might know where I can help him find either the memcals or a salvage computer?

    1. Jan Olsson

      Jan Olsson

      Hi Dave!

      It is rare that a computer fails in a Cadillac and I have never personally had to replace one. I would say that a computer is one of the very few objects that I would buy from a salvage yard just because they never seem to fail but I guess that they a hard to come by since the car is fourty years old.

      Other sources/solutions would be:

      1) have the mechanic to replace the computer at no additional cost, they messed it up...

      2) Ebay, Amazon etc. Google it. I suggest that you find out what engine option the Eldo have to be sure to find the right part. I found this info: Problem with 1981 Eldorado ECM and PROMS (cadillaclasalleclub.org)

    2. Dave42


      Thanks Jan

      One of the guys I build motors for found a complete ECM out of an 81 Eldo in Miami junkyard.

      I am unsure if it had the 4-6-8 delete conversion done but at least it has a memcal and prom in it.

      They are going to plug it in and try it.

      I will update on success or what I have to do to emulate the 4-6-8 function so he can drive 

  11. Started the engine tonight after sitting for 2 years after charging battery started up with bad miss. I will be repositioning the car in the drive in the morning and covering with large tarp to start disassembly.
  12. I f any of you guys have a set of the Cam bearing index tool from Kent Moore 6686 I would love to get the measurement of the two plate tools. Gap and distance. If I pull down the motor before the measurement I will make the tool by measuring my engine and post the drawings here.
  13. Started Designing some of the Tools for this Build Today Happy Easter. As I weld and I am an advanced fabricator Machinist engineer type. I wanted to do this build out of my home garage however My race car sits there so I am building in the driveway under a big Live Oak Tree. Message me for the sketchup file it is just over 207K zipped. So this is a design for the body lift based on a hydraulic ram driven Rhomboid with telescoping rear supports. To use I plan to first jack stand the car wheels off and slide under the body, clamp the pinch clamps to the body jack seams and using the porta-power pump raise the front bumper of the car to about 40" in a clam shell opening rear lower front swinging up motion that makes it easier to detach and reattach the carriage. I will be designing and fabrication a carriage dolly that will index off the rear mount like the factory build line install JIG. At The factory the body comes in from above and tilts at about a 15 degree angle as the bottom carriage shuttle joints index on big pins and then merges allowing the four corners to be bolted easily. Hydraulic cylinders 992207.pdf
  14. This is the kind of great stuff I like to build. I will be watching for interest as I build EFI controllers how big is the Northstar demand for controllers anyhow? There are a lot of electronics that really need upgrade on these motors while the engine is an engineers motor the ignition and fuel is difficult for the after market. I have seen Cadillac Motor Sports guys put together kits that use the DIS systems from LS motors on carborated blown versions of the northstar. I recently built a prototype for 600Hp LT-1 Chevy motor in my garage but have not tested it or started that engine overhaul. I have some early work on Sequential for my 393 LSX build coming up after my Seville I may grab some of that and just push out a controller for non emissions Northstar builds. I think I will just go ahead and design and build a NorthStar Controller with a can bus link for the stock dash but I am intended on a whole new cluster for my Seville.
  15. Great idea I have a set of these Kent-Moore J-44212 GM Northstar Camshaft Holding Tool Set I will measure them and leave another tip in my upcoming build thread.
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