Quote:
Originally Posted by AlmostThere
Hi Guys,
I am very new to the site but hope to get some help from the veterans here. I am 28 and I'm looking to get a Backdraft Cobra. Because I'm not a purist like many of you might be, I was looking to turbocharge my Cobra. Jay at Vintage Motorsports has been extremely helpful is telling what I need for this project.
First I need you guys to give me the cons and pros on turbocharging an american V8 such as a 427...402 or a 351 engine. Jay mentioned that the compression ratio for a turbo needs to be 8:1 so most engines are out of the question as they all put out 10:1 ratios. If anyone thinks that I have wrong info please let me know. So please advise as to what engine would best pair up with a singe or twin turbo set up. I am leaning towards Garrett twin or single turbo systems.
Second...please advise if there will be much turbo lag with a V8 or should I just simply get a supercharger instead. I want the torque to be available at all times so If I'm going 65 I want to be able to shoot to 100 quickly.
Last thing..please let me know if you think the car will look good in a matte black satin finish. Its a rare combo I know but I have seen it on Lambos and such and it looks so cool. Wonder if it will look cool with PowderCoated side pipes...
By the way Corky Bell and his project is where I got my inspiration for a turbocharged cobra...
http://www.hermanndesign.com/cb1project/cb1Cached.html
Anyway...please help as I am ready to order this insane car but the heart of the snake is still confusing to me. I would appreciate all comments good or bad and please let me know what you think
Thanks a lot guys,
Max |
I have a setup quite like what you are discussing. I have a 408w fuel injected with a 93mm garrett t42gtr air to water intercooled superformance. See my gallery. I am also running with the t56 viper 6spd. The performance with 7lbs of boost is spectacular and streetable. My engine is purpose built with 8.1 comression. We spec'd the cam to the turbo and the power band hits hard above 3500 to about 6800. The rev limiter is set at 7400 but I've never pushed it that hard. I am using a FAST engine mgmt but would recommend looking at "Big Stuff" if you are serious about running with a turbo. There are a lot of other engine mgmt systems out there and I would defer to others on this forum for their expertise. My preferences are born out of local familiarity as my friend is also the engine professional. We are putting down about 600 rwhp @ 7lbs of boost. We did run 25 lbs and jumped all around on the dyno showing some crazy numbers but the car wasn't driveable on street tires and the drive train isn't really up to the task if we did get it to hook. I've been driving the car in this tune for two years and have gotten very familiar with its handling and I am satisfied with it relative to my driving abilities and wallet.
pros with this setup:
1.streetable with major tq. available.
2.great gas mileage (relatively) if you keep your foot out of it.
3. run with the big block guys but have extended
cruising range with the t56.
4. quieter engine for around town idling and loafing in traffic.
5. be prepared to run higher octane if your going to track it. We dyno'd using vp116. This is the fuel my engine guy recommends with more boost and track time. (I still haven't taken it to the track.)
cons with this setup:
1. big block guys don't like us running with them and getting ok mileage to boot.
2. quieter engine.... this is due to the lower compression, cam and turbo. you won't have that lumpy engine idle.
3. more difficult and expensive to build and setup.
4. more expensive build to accomodate the extra torque. The rear end definitely needs attention if your going to buy someones roller.
5. HEAT.... turbos run hotter. I get some pretty high temps (225 f ) in heavy traffic on 90 + degree days. We are still working on this. the engine is fine while driving, stop for a freight train gotta shut it off.
well, I've given you some of my experiences.... good luck with whatever direction you decide to go.
mike
Need your opinion on engine modification and selection
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