I tuned & dyno'd at 3000 miles after the rebuild (407 rwhp at 14psi), and at 7500 miles, she was starting to run pretty crappy, so back to the dyno for a little more tuning. So after a little more break in, and a throttle body modification (Brian's TB mod) we got 442 at 14 psi. Below is a list of my mods:

1979 Triumph Spitfire
Project link:
http://www.home.earthlink.net/~ricgibson/

1988 S4 13BT drivetrain includes:
Haltech E6K
Turbonetics T04 60-1 w/.84 a/r divided p-trim turbine
50 mm HKS external wastegate
Greddy ProfecB boost controller
720cc/min primaries, 1600cc/min secondaries
Walbro high flow fuel pump in 15 gal ATL fuel cell
AEM variable rate FPR
12" X 18" X 4" Spearco FMIC
Ported Throttle Body Modification
Street Ported, FD seals
65 psi oil restricter
18lb Flywheel w/ACT 6 puck clutch
1987 RX7 rear end subassembly (w/LSD & independent suspension)

Suspension mods include:
Custom 2" square chassis
8" wider track
Coil over Koni's all four corners (adjustable shocks)
Adjustable spring perches (fast spring changes)
Adjustable upper/lower control arms
1997 Camaro Z28 rack & pinion (very close ratio)
1993 RX7 front brakes & rotors (11" with 4 piston calipers)
1987 RX7 rear brakes & rotors (11" with 2 piston calipers)
Front/Rear brake biasing controls

Curb weight 2200 lbs
Corner weight link:
http://home.earthlink.net/~rgibsonsp...rnerWeight.jpg
442 rwhp/350 lb ft torque
Dyno Sheet link:
http://home.earthlink.net/~rgibsonsprint1/CarDyno.htm

POWER/WEIGHT RATIO = 5 lb/hp

 

nice! i believe i remember that engine. in fact i have plenty of pictures of it if its the one i'm thinking of. its the one that was painted british racing green, right? i remember brian having to fly out to colorado due to a problem with the extra dowel pin not letting the engine seal properly. nice numbers!

 

Good numbers, but I think your boost reading is off or something......

The reason I make this comment is because on your 6 psi pulls on Apr 24 and Dec 21, you've got around 200 lbs-ft at 5500 and about 300 peak rwhp.

Your more recent graph shows a 442 rwhp and a 368 rwhp run... at 14 and 6 psi.. ??? Somehow you pulled out 300 lbs-ft of torque at 5500 rpm at 6 psi? That's 50% more torque from tuning alone! My guess is that would be around a 10 PSI pull.

I am not trying to start a battle, just trying to make sure we've got the right boost level. Can you double check it?

Thanks,
Brian

 

I don't think the boost controller was changed (low boost setting), although I suppose it's possible...we didn't do a data log on that dyno pull. The boost guage on the dash is attached to a different (probably less accurate) place on the manifold than the Haltech...it showed 6-8 psi on that particular pull.

We did, however, do a data log on the 14 psi pull, so I'm pretty certain that the big power pull is accurate, which is really all I'm showing off here.

As far as starting a battle, you know me better than that...when flames get thick I just smile and quit posting (hence the low post numbers).

 

that ******* impressive, nice weight too. got any times?

 

Not yet...I'm getting custom racing wheels made, then finding a good set of slicks before I run the quarter mile.

I may not get many chances at it, Bandemere won't let a convertible car without a full racing cage run if below 11 seconds. I'd like to get my traction/launch control hooked up first, should lower launch times...

 

Yes, that 14 psi pull is sweet! I have a very similar turbo except with a 1.00 A/R... I can only imagine how that car must move since it weighs about nothing! hehehehe

 

I'm also curious to know your timing numbers at the 14-15 PSI range. How much split do you run? I run about 15 deg leading timing with a 18 degree split at 14 PSI. I am running a bit richer than you at about 10.8-11.2 AFR in that range. Got any pictures of your porting?

 

What trans is that? The FC non turbo box? I hope it holds together

 

well it says S4 BT drivetrain. I would assume its a BT tranny. I'm 100% sure a stock N/A tranny would have insinrated at those numbers.

 

nice numbers but 12:1 afr is kinda lean esp for that much power

 

Bah! I've been trying to get Rx7 guys to meet and you have such a beautiful car and never came for a visit! You should visit the regional forum every now and then! Awesome car!

 

Awesome numbers, very similar setup to mine, except you put down 30 more horses. But then again my car was dyno'd on a very hot and humid day, that could be the cause.

BTW- I love your car, nice creativity.

 

Added your car to my dyno page.... see my sig for the link