When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I had my car on the dyno today. Made 407/391 on a Mustand Dyno, which I was pretty happy with. The tuner mentioned that the car peaked at 6K and felt that was strange, asked me if I checked dot to dot alignment when installing the cam, which I did. I called New Era and was told the SSHT on an LS1 can peak anywhere between 6K & 6500 cam only, which sounds like a pretty open window. Wondering what everyone's thoughts are based on the graph and the mods I have, especially those who have run the SSHT cam only. I am planning to pull the front cover to double check timing alignment, but would like some opinions on if the peak seems normal for this setup or any guesses as to what's going on.
The car is a 2001 and has the following mods:
FTI Streetsweeper HT 228/232 111LSA
Dual Valve Springs, TI retainers, 7.4 pushrods
42LB Racetronix Injectors
Racetronix 255LPH fuel pump kit
TSP 1 7/8" headers & Y pipe, stainless works turndown muffer
MTI lid
BBK 80mm TB
12 bolt with 4.10's
LS7 Clutch Kit
Stock LS6 Intake
160 Tstat
Y pipe looks good, no damage from the torque arm coming down on it nor mashed flat from the bottom. The headers and y only have about 200 miles on them so far so now close encounters with speed bumps or driveways yet.
It's the merge the comes with the old style TSP Y pipe. I haven't particularly heard anything terrible about it other than the general fitment complaints of the old style y pipe.
The low and mid range are great. I'm just surprised that the power doesnt flatten out at all at the top of the rpm range and wondering if it makes sense given the specs on the car.
The low and mid range are great. I'm just surprised that the power doesnt flatten out at all at the top of the rpm range and wondering if it makes sense given the specs on the car.
No it does not. It should carry better. I have seen the ls6 intake do better, which is why I was asking about exhaust. You have a map reading at wot? If it's low that would tell you something is going on intake side.
The way power doesn't flatten out is a little odd, but nothing too jarring. I agree with checking WOT MAP readings versus ambient air MAP reading. If it's not more than 2 kPA the exhaust is the most likely culprit but might not be worth messing with.
I'm assuming my tuner didn't record the runs. If it stops raining here tomorrow I'll try to record a few wot runs on my aeroforce to get an idea of the readings.
Ok.
I was expecting better performance in the top end though.
It peaked and fell off quickly.
On the FTI website though it does show a really nice looking curve in an LS1 with power holding on all the way to 7000rpm.
This is with long tube headers and a full exhaust.
Your power curve looks very different.
Obviously advanced cam timing
Cam ground incorrectly
Afr off
Timing not enough
But i would likely point to the maf and the lid.
Remove maf, do a speed density tune and see whats up.
Also check fuel pressure at wot.
Also make sure that bbk tb opens all the way. Not just by tps voltage and % but also physically. They come with that adjustable bracket but sometimes its not correct. Id ditch that tb to be honest its not going to hold you back any.
Hello OP. Just to give my opinion, I don't think your graph is too far from the other Streetsweeper HT cam graph. Your dyno graph is on a different scale that is almost twice the dyno jet chart. As your power seems to be right around 400rwhp at around 6500rpm. Another similarity, with both graphs shown, is the tq dip around 4300 rpm. Along with right around the same tq peak rpm then dropping.
May be right where it should be. Hope all goes well with it OP.
Ill have to disagree there. His is definitely peaking early vs where it should be. You can clearly see the other graph carry farther and plateau at a point and not drop off.
Ill have to disagree there. His is definitely peaking early vs where it should be. You can clearly see the other graph carry farther and plateau at a point and not drop off.
No problem with that(your disagreeing). As the Dynojet chart states the pk hp is right at 6200rpm. While I'd guess the Mustang chart hp pk is right around 6100rpm or just below. So you are correct. But these are two different cars on two different dynos. It def would be better if the other chart revved higher to compare more with the drop.
Just stated my opinion on how similar the tq curve is between the two charts also. Would you think it may be something else maybe concerning the exhaust setup as Darth brought up?
Last edited by SoFla01SSLookinstok; 11-01-2019 at 10:41 PM.
10-30-2019, 05:05 PM
Streetsweeper HT LS1 Cam Only Dyno. Peaking at 6K 
