Help with parts selection.

469 Views 11 Replies 5 Participants Last post by salvageV6, Apr 14, 2002

BoostedCutlass

Discussion Starter · Apr 13, 2002

Im looking for a recipe that would fit my car. Its not a GN or T Type, its a Cutlass that started life with a 231. The car has proven 11.20's capabilities and I believe it can go as fast as 10.50. Current drivetrain components include:
4.11 geared 9" Ford
SSM Liftbars/air bags/adjustable upper control arms/soon to be converted to coil over shocks
THM-400 transmission with B&M 2800-3200 10"
converter
8 point roll bar with extra bracing added for rear suspension/15 gallon fuel cell
A rebuilt 86 GN long block with a Comp Cams 206/TRW pistons/86-87 iduction/ACCEL DFI/mild home ported heads with polished chambers
I can run up to a 30" slick
I expect the car to weigh somewhere in the 3350 to 3450 range with the V6 turbo engine and myself
I dont mind driving a "race car" on the street
I aquired Hooker Super Comps thinking that the 4.11 gears and 3200 stall capability would help compensate for any lag the Hookers might create
I have every intention of running a front mounted intercooler
Now, what I need help with is turbo and injector selection. Im looking for ~500 flywheel horsepower OR 10.99 elapsed time
I also need feedback on the current components in/on the car
Im sitting out this race season(and only this race season!) to build and tune this turbo motor so things are happening quick for me. Any help is appreciated.
Thanks in advance for your time and effort with this matter.

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ULYCYC

· #2 · Apr 13, 2002

You said "The car has proven 11.20's capabilities" Is this on paper or at the track?? What was the last timeslip and with what combo then we can go from there...

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ED BAKER
87-T-TYPE, PT54,MSD50's,Crane Billet Roller,JE forged20over,P&P Heads,Manley valves,Hemco 65mm& Acu65TB,V2 FM, P.I.9.5 -7disc,Jimmys Trans, [email protected] boost.10's soon
93 PARK AVE"SUPERCHARGED"
67RS/SS350 CAMARO
mailto:[email protected][email protected]</A>
http://www.modernmusclecar.net

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BoostedCutlass

Discussion Starter · #3 · Apr 13, 2002

The previous engine was a 350 Olds, the 9" had 4.56 gears, a TCI 10" converter stalled around 4200, 30" slicks. The best run was 11.28 at 116.6 with 60's around 1.60
I reached the limit of the Olds motor and wanted to loose some front end weight so the V6 turbo Buick seemed like the most likely candidate. Ive run agianst some fast GNs, so I always admired what Buick and the aftermarket had accomplished with the 231.
So, there really is no baseline to start with. Im building from scratch with 10 second expectations and the parts Ive listed
Something I need to add is that I have a 110 octane limit- nothing higher around me.

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TWIN86GNS

· #4 · Apr 13, 2002

BoostedCutlass,

It looks like you have a nice setup there and it should run quite well.

I worked the math out and with a 4.11 geared rearend and 30" tires that is effectively a 3.56 gear ratio with stock size tires. If you ran a 3.90 gear with a 30" tire you will effectively have a 3.38 rear end ratio. So right now it looks like you have a bit too much gear.

When you are staying with the stock style heads these cars seem to like lower gear ratio's. I run 3.50 with a 28" tire and my car seems to like it that way and I also run Hooker headers. Our cars make more torque than horsepower. I have seen many people post their numbers from chassis dyno's and a lot of them have an extra 100 - 125 ft#'s more torque than horsepower ie 400 hp and 525 tq.

Probably a nice turbo injector combo would be something like a T-70 with 72# or 83#/hr injectors. A T-70 should provide lots of power down to low 10's, so 10.50's should be O.K.

Good luck,

Paul Beal
[email protected]

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ULYCYC

· #5 · Apr 13, 2002

Fist thing is the converter will not work with the Buick motor. Look for a precision 9.5 (my choice) or a 9in with a stall of 3400-3800. The gears are too big. If you are going to run 30in tires then 3.73 would be OK. These motors power peak is around 5500rpm's so you can't go through the traps at 6500rpms. If you plan on alot of 10.7-11.0 runs I would linebore the motor and go for a girdle and steel caps. Any cam from stock to a full roller will get you into the 10's. Turbo PT54, TA45, T70 anything in this range and injectors 55's as a start.

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ED BAKER
87-T-TYPE, PT54,MSD50's,Crane Billet Roller,JE forged20over,P&P Heads,Manley valves,Hemco 65mm& Acu65TB,V2 FM, P.I.9.5 -7disc,Jimmys Trans, [email protected] boost.10's soon
93 PARK AVE"SUPERCHARGED"
67RS/SS350 CAMARO
mailto:[email protected][email protected]</A>
http://www.modernmusclecar.net

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BoostedCutlass

Discussion Starter · #6 · Apr 13, 2002

Am I correct in understanding that 3.42:1 is the ratio that works best? I have 3.50 and 3.55 as options, I guess 3.55 with a 28" slick should be my choice. That equates to ~5100 at 120 mph in third gear(I only have three!). 2750 rpms at highway speed, I can live with that. Huh, this looks to have the makings of a wolf in sheeps skin. Is it possible to have a [email protected] turbo Regal with decent street manners?
Ive received some mixed opinions about the Hookers. I dont have an 'original' set of manifolds. Are the Hookers going to work for me or not?
Thanks again,
Mike

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ULYCYC

· #7 · Apr 13, 2002

The 3.55 with 28" tire is close enough. I crossed the traps yesterday at [email protected] with 28" tires and 3.42 rear.I have Hooker headers
and they are ok in the 10's and low 11's but suck any slower than that.

------------------
ED BAKER
87-T-TYPE, PT54,MSD50's,Crane Billet Roller,JE forged20over,P&P Heads,Manley valves,Hemco 65mm& Acu65TB,V2 FM, P.I.9.5 -7disc,Jimmys Trans, [email protected] boost.10's soon
93 PARK AVE"SUPERCHARGED"
67RS/SS350 CAMARO
mailto:[email protected][email protected]</A>
http://www.modernmusclecar.net

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BoostedCutlass

Discussion Starter · #8 · Apr 13, 2002

Time for a gear change. Thanks to all for your help.

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Steve Wood

· #9 · Apr 13, 2002

A few guys have made out with lower gear ratios but with only three speeds, you are gonna have to come up a bit. Those 30" tires might work pretty well with a lower gear.

I think LC may have run 4.11s on "Black" but I may be thinking of someone else and quite a few ran 3.73s with 28" tires at one time.

You can get into the tens as long as you try to keep it around 540 hp. If you want more, you better have a girdle.

Altho these cars are not cam sensitive, it may help to have something like a 206 roller...the problem with big cams is that the rpm band is pushed upward and these engines start to walk the crank around as you pass 5500 rpm...again a girdle helps.

Ed's advice on converters is dead on. I would suggest something like a John Craig 45, 65# injectors, and a good intercooler.

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salvageV6

· #10 · Apr 13, 2002

Ed is your signature due for an update?

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ULYCYC

· #11 · Apr 14, 2002

Originally posted by salvageV6:
Ed is your signature due for an update?

Not really... The track yesterday was cracking down on rollbars so I couldn't get into it. I was just doing top end runs after rolling out of the hole. I did 121mph with 22lbs of boost. Next outing at Englishtown Test and Tune I'm cranking it up to 25-26 and looking for 10.90's.

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ED BAKER
87-T-TYPE, PT54,MSD50's,Crane Billet Roller,JE forged20over,P&P Heads,Manley valves,Hemco 65mm& Acu65TB,V2 FM, P.I.9.5 -7disc,Jimmys Trans, [email protected] boost.10's soon
93 PARK AVE"SUPERCHARGED"
67RS/SS350 CAMARO
mailto:[email protected][email protected]</A>
http://www.modernmusclecar.net

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salvageV6

· #12 · Apr 14, 2002

Someday I'd like to go to the track now that the cat. is off the car.

Gained 5 friggin' PSI just removing that.

Unbelievable, especially since it was a 3 year old "high flow" one that came with the THDP.

Can't wait for dyno. day.

I can wait for my tranny to die however...

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