Just got on the dyno with my boosted 355

Just got off the dyno today, and my new setup net me 566 rwhp and 535 rwtq.

It consists of everything in the sig, plus the following

SRP forged Pistons, 9.0:1 compression
Eagle H beam rods
Eagle forged crank
lt4 timing chain
MSD OPTI/ 8.5 MSD wires
Ported lt1 heads 291 intake, 210 exhaust @ .600"
Comp Blower cam 224/236 114 lsa .535" intake, .555" Exhaust w/ pro magnum 1.6
14 psi from D1SC and twin high flow intercoolers

Net RWHP was 566 rwhp and 535 rwtq...The car will be on the dyno again friday for some tuning adjustments (car was running a little fat on the bottom end), so it should get me to about 575 rwhp. How are my numbers?

great looking numbers.....congrats

Not a big fan of those numbers should see another 100-150RWHP more than that IMO.
Put on a Better intake setup with a Bigger filter (I bet your running the ATI setup) and if you do have lt1 heads I doubt they flow 291 and 210 on the exhaust (been doing this awhile and that seems a little high out of LT1 heads without Drastic work)


What pulley combo are you running and how high are you reving it, We need to figure in how hard your spinning the blower????

Graph? Where did it peak? Still deciding on what cam to run.

Tuning issues? 9.0 seem to be ok with 14psi and pump gas?

What do you think about the srp pistons? Been shot down many times.

Numbers look pretty good to me. Congrats. What rpm you run it up to? You'd probably do better with a large FMIC.

Numbers look pretty good to me. Congrats. What rpm you run it up to? You'd probably do better with a large FMIC.

It Peaked out at 6500 rpm. I am at 5800 feet above sea level, so its got the 3.4 inch pulley to net me 14 psi up here. I plan on maybe running a custom air/water cooler because I dont really like the idea of hacking up the front end. There mighy be a chance for methanol here soon too. I will post the updated numbers and the dyno sheet this friday when it sees the dyno again.

As far as I know on the heads, They are ported by TPIS and is the stage 2 port job. Saw the flow bench paperwork, and will post them up soon.

I will be ordering the mufflex d1 intake pipe soon, will this increase boost pressure? The website says ~ 5 psi gain, But im thinking 1-2 seems more realistic...

Graph? Where did it peak? Still deciding on what cam to run.

Tuning issues? 9.0 seem to be ok with 14psi and pump gas?

What do you think about the srp pistons? Been shot down many times.

The SRP's work fine for my power level, but if i were building a true racecar, i would get the JE's.

This motor is tuned to run on pump gas, and 9.0 is a safe way to go. The car saw no knock during the dyno runs.
Heres a quick video of the car at idle...this is with pacesetter long tubes and lanes true duals

http://www.youtube.com/watch?v=q5bDGr0mho4&eurl=http%3A%2F%2Fwww%2Emyspace%2Ecom%2F

yeah seems little low, esp if u were seeing 14psi on teh boost guage...i made 697rwhp with my guage reading right at 15psi :bow:

yeah seems little low, esp if u were seeing 14psi on teh boost guage...i made 697rwhp with my guage reading right at 15psi :bow:

You have a stroker motor...mines a 355...plus you have AFR's. And what exactly are those cam specs on that stick of yours?;)

schurterslt1 made 690rwhp @ the same boost level I believe (with 355ci), but he runs a custom BRE cam (similar in size to a cc306) and AFR210's.

I am just throwing this out there to show you that you still have potential to gain alot more... better heads and better cam. Your numbers are nothing to sneeze at though.

cjmatt made 518rwhp/468 ft.lbs @10psi (with 355ci), on a mustang dyno. He has a BRE cam, stock unported LT1 cylinders, stock throttle body, and mid length headers.

I am also just throwing that out there. Your numbers are pretty solid, and I think you could ring more power out of it.

Was this on a mustang dyno or a dynojet, as the two are very different. I would say for a 355, with stock ported heads on a mustang dyno you are pretty much right on.

I have a 383 with AFR 180's, and 8.8:1 CR on pump gas, and I did 590 RWHP on a hot day on a mustang dyno at 15.3#'s of boost. Seems like you are pretty much where you should be IMO.

Depending on what AFR heads you plan on stepping up to, and what crank pulley you could change to, as well as runnning a methanol injection setup, you could gain quite a bit. But again, I would say your numbers are an accurate reflection of the mods done to your car.

This guy is a mile up too though, everyone remember that.

so the numbers arent SAE corrected?

Hmm, didn't think about that.

so the numbers arent SAE corrected?

They are SAE corrected.

This guy is a mile up too though, everyone remember that.

AND I have a moser 9 inch with 31 spline axles..

This guy is a mile up too though, everyone remember that.

Doesnt matter. His dyno numbers are corrected. His actual numbers are likely 17-22% lower than that given the average correction factor we see up here. One thing to keep in mind though, is that him running 14psi boost is like anyone else at sea level running about 11-11.5psi boost. His absolute manifold pressure is around 26psi.


Nonetheless, if you had a 1.2ish correction factor your actual numbers are around 460-470rwhp. For that absolute manifold pressure being seen (even with a 9 inch rear axle), the power numbers do seem low. Was it a mustang dyno?

Boulder huh? You should come up to Ft Collins some time, and nice numbers btw.

what is it tuned with, and who tuned it :)

wow... ya'll aren't too far from me. I was in fort collins a couple weeks ago.. wish i knew all your peoples numbers!

but you bring that car down to sea level and tune it... run 2#'s less boost and i bet it is faster than it is up here in the nose bleeds

if you could post the graph (preferably the run file) then it would help alot.

i can tell you that up here (colorado) the atmospheric pressure is ~11.8 (instead of 14.7 at sea level)
when i was running 24 psi guage, my ecu was only seeing ~18 psi.

and the way most dyno calculate correction factors are way off for boosted vehicles.
get the car to a track and the trap speed and weight will tell you the power your making :)

good luck, hope to meet some of you colorado people some day

if you could post the graph (preferably the run file) then it would help alot.

i can tell you that up here (colorado) the atmospheric pressure is ~11.8 (instead of 14.7 at sea level)
when i was running 24 psi guage, my ecu was only seeing ~18 psi.

and the way most dyno calculate correction factors are way off for boosted vehicles.
get the car to a track and the trap speed and weight will tell you the power your making :)

good luck, hope to meet some of you colorado people some day

The car is getting dynoed again here in the next hour or so. I sent the PCM off for tuning, and saw 566 rwhp on the first re-tune. They sent the chip out again wednesday for some fine adjustments, and the chip got back today. They raised the rev-limiter from 6,000 to 6,500, leaned the a/f ratio at the low end, and added more fuel from 4,000 - 5,000 rpm. Hopefully this tune is spot-on this time and we should see some better #'s.

I too live in Colorado Springs. I was in Boulder when I went to Colorado University, but I am done now. The engine was built by RMCR here in the Springs. Ill post the updated dyno graph later tonight.

So your sending you chip out to get tuned??? Im not using the stock ECU anymore and i have a chip burner for the 93 chip. Pm me if you want to know more.

Those number are way better than what I had, but I was on a mustang dyno! Who and where did you dyno at? Race gas?

his torque numbers closely match my 14psi with ATI twin high flows tq number... But I only turned it 4800 rpm due to some ignition issue I can't figure out. I was super-conservative on timing while trying to figure out the ignition issue or probably would have made quite a bit more... (i really only have 600rpm of usable numbers at 14 psi)

What's your timing table look like? post the graph :)

his torque numbers closely match my 14psi with ATI twin high flows tq number... But I only turned it 4800 rpm due to some ignition issue I can't figure out. I was super-conservative on timing while trying to figure out the ignition issue or probably would have made quite a bit more... (i really only have 600rpm of usable numbers at 14 psi)

What's your timing table look like? post the graph :)


Just got the tune back and we got the car on the dyno again and it put down 596 rwhp on only 12 psi...I thought I would see more boost with the 3.4 inch pulley, but figure in alltitude and all and i get 12 psi and the blower is pretty much maxed...i will receive a copy of the dyno graph tommorrow when i go to pick it up from the shop:D

nice!

wow nice new numbers kredz28
at the beginning of this post i thought your numbers were looking good. we have a similar combo and i made 567. after reading a little more i guess my numbers are low. im running a 3.85 pulley and seeing 13#'s still the same set up in my sig. mine was tuned pretty conservatively by carolina auto masters. what do you guys think, i dont have timing specs, 6500rpm??

Its probably your camshaft...the 224/236 is a smallish cam for a 383...i would get a higher duration cam, with well over .600 lift..also getting a more aggresive tune will obviously gain you more power

600 to the wheels @ 12psi sounds pretty good to me.