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4.9 liter what?


jhfiero

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http://www.fastchip.com has a chip for it. Otherwise, high flow cold air setup, performance exhaust, and you've got all the 4.9 is going to do.

Another option is to swap to the Northstar 4.6L DOHC engine, but I assume you are asking what can you do without spending a lot of money?

Bruce

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See if you can get aholt of an Allante 4.5 intake and FI. It should get you 20+ hp.

In 1990, the 4.5 was used on all Cadillacs, and it was rated at 180 hp on everything except the Allante, where it was rated at 200 hp. In 1991, they went to the 4.9 on everything else and rated the 4.9 at 200 hp, but they left the 4.5 with its special intake and FI on the Allante until the Northstar was ready.

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I always wanted to try that, and you rarely can find them on ebay. It is a cool looking tuned intake, if you have room for it.

Bruce

2016 Cadillac ATS-V gray/black

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Just bolting on an Allante intake might do very much. The power increase is only in the top rpm range. On my 87 Allante, max rpm is 5500 while my 88 Eldorado is 4500. If you had an automatic transmission, it would have to be modified to shift at a higher rpm. Also, the Allante had different heads that would allow reving up to the higher rpm's. The stock 4.X heads are not made for high rpm's. To be honest, my Eldorado feels more powerful than my Allante. But once the Allante engine gets wound up to 5000+ rpm, it takes off.

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So ya wanna go fast? See if if ya can keep up to this one.

http://caddyinfo.ipbhost.com/index.php?showtopic=12849

2001 STS Mettalic Otter Grey, Black Leather, 213,000 kilometers - miles - ? Still running strong!

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ASG in Indianapolis was doing a package that raised the 4.9L hp and torque. They would bore the engine out to 5L and ported/polished the heads as I recall. The problem is, once you get into the things you are asking about, for the same/less money you could swap to a Northstar engine with 50% more hp build in.

2 questions of Hotrodding: How fast do you want to go? How much money do you have?

Bruce

2016 Cadillac ATS-V gray/black

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Yes, adding a turbo would be a way to add significant power on these engines. The hardest part will be how to handle the extra fuel requirements of a turbo. Have you done research on this? My suggestion would be to piggy-back an extra injector run by megasquirt to give your engine additional fuel. http://www.megasquirt.info/

If you are going to turbo your engine, I would just keep the original intake. Forced induction would negate the gains from an Allante intake.

If you want to read more, go to this link:

http://www.cadillacforums.com/forums/ht410...-stage-1-a.html

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