Calibration

[1QK4DR]

How much of an increase would I'd see with a fwd performance 15psi computer 20% injectors and 2.5" mandrel bent pipe over stock. Hp increase??? How much off a quartermile and gain in trap speed?


Joe

1991 spirit rt
14.9

best mph 95.67

[mad_]

My guess would be that you would run between a 14.3 and a 14.7. I would like to say lower but I havent hit lower yet hehe.

[4sfed4]

Quote:

Originally posted by 1QK4DR How much of an increase would I'd see with a fwd performance 15psi computer 20% injectors and 2.5" mandrel bent pipe over stock. Hp increase???

Stock car at 13 psi with 3" exhaust with cat vs. ND/FWD cal at 13 psi, +20's.

Both cars with stock turbos, stock ICs, etc.

See if you can guess which dyno is which

[4sfed4]

Quote:

Originally posted by mad_ My guess would be that you would run between a 14.3 and a 14.7. I would like to say lower but I havent hit lower yet hehe.

With 13 psi boost my car ran a 13.4@104.7 with a loust 2.15 60 ft. Any other R/T would do the same.

[1QK4DR]

Did your car put out more power stock with a bleed valve??? Also did you use a 3 inch down pipe and full straight pipe out the back 4sfed? Would a 2.5" pipe into a 2.5" cat and 2.5" out the back be close to that output with 14 psi of boast?

[Rob]

Quote:

Originally posted by 4sfed4 With 13 psi boost my car ran a 13.4@104.7 with a loust 2.15 60 ft. Any other R/T would do the same.

Mine ran 14.4 completely stock down to the paper filter. That was back in '93 when it had about 14K miles. Only time I ever took it to the track. Never tried it again when it was making 15#...but it was quicker

I would think it would be quite a bit faster with those mods.

[4sfed4]

Quote:

Originally posted by Rob Mine ran 14.4 completely stock down to the paper filter. That was back in '93 when it had about 14K miles. Only time I ever took it to the track. Never tried it again when it was making 15#...but it was quicker I would think it would be quite a bit faster with those mods.

It would be if the rear bobble strut wasnt detached! I didnt find out why the car wouldnt leave the line hard until I got home

The car really didnt have lots of mods on it to run a 13.4. Only 13 psi boost and good 3" exhaust will do it. Mine happened to have a larger IC and +40's, but to be honest (according to the dyno as well), at the 13 psi boost level, you really dont need that stuff. The IC helps with heat soak but doesnt really add much power until your airflow demands go up.

A stock car will never come close to 105 mph though. A bog stock R/T makes right around 190 whp. Once you open the exhaust and add a couple of psi boost, itll jump to around 250-260 whp which is what my car was making when it was at the track last time.

14.4 stock is about ideal with good traction and good air.

I have some new ammo under the hood and will find out what it does on Saturday afternoon at the Dynojet.

[4sfed4]

Quote:

Originally posted by 1QK4DR Did your car put out more power stock with a bleed valve???

Yes......But, if you keep the factory exhaust, the car will get choked out. If you yank the factory exhaust and put a 3" system on there (without cat) and dont even change the boost from the factory 11 psi, youll pick up like 30 hp!

Quote:

Also did you use a 3 inch down pipe and full straight pipe out the back 4sfed?

It was stock O2 housing with 2.5" outlet, very short section (3" maybe) 2.5"pipe welded to 3" pipe and 3" the rest of the way.

Quote:

Would a 2.5" pipe into a 2.5" cat and 2.5" out the back be close to that output with 14 psi of boast?

Probably. The 3" cat on my car cost 12 whp at 13 psi boost however.

[Namikuz]

Well I can't wait to get the turbo and install the dual stage boost controller. Launch at 9psi and then 14!!! Should be FUN!!!!!!!!!

[1QK4DR]

I think my car is capable of running a 14.5 stock. I ran 14.9 at 90 with a 2.355 60 ft time(best 60 ft time I have had so far the rest have been 2.5-3 seconds) missing 4th gear. My best trap speed is a 95.67 mph so far but I haven't cut a good 60 ft time yet.
My car now is back on the road again. It keeps having problems,lol. This week was a locked caliper. So now my car has all new brakes, 3 new rotors, 1 turned, Two new front calipers.

Oh by the way my car use to run at 19 psi vac at idle and now it's at 16. Could this be because I didn't adjust the timing marks right on the car?

[4sfed4]

Quote:

Originally posted by 1QK4DR Oh by the way my car use to run at 19 psi vac at idle and now it's at 16. Could this be because I didn't adjust the timing marks right on the car?

Yes...you could have the cam timing slightly retarded.

Also, check for simple things like a small vacuum leak.

[1QK4DR]

When your ran your spirit with just a bleed valve to 13psi did you use 20% injectors or did you use the stock injectors.

Tell me what kind of power you put down saturday.

[4sfed4]

Quote:

Originally posted by 1QK4DR When your ran your spirit with just a bleed valve to 13psi did you use 20% injectors or did you use the stock injectors.

Stock injectors. Thats about as far as you can go with them however with a 3" exhaust with no cat.

Quote:

Tell me what kind of power you put down saturday.

Dyno appointment was cancelled. My fuel pump died! Somehow, the pump decided not to run on Saturday morning Its locked up and gets hot as a firecracker! So, Im searching for a replacement as we speak.

[mad_]

Quote:

Originally posted by 4sfed4 With 13 psi boost my car ran a 13.4@104.7 with a loust 2.15 60 ft. Any other R/T would do the same.

Any other R/T except mine. I have 2.5" exhaust a ND cal, +20s, ported exhaust manifold ( did it myself ) and no balance shafts.

On my buddies Tazzo my best time was a 14.8 and I was pushing about 10-12 psi of boost. I had a 2.45 or something 60 ft. I think my best 60 ft. time to date is 2.38 or something like that. I wish I knew why I am so slow...

[1QK4DR]

Mad what was your trap speed thru the quarter?