SDPC 402 Dyno *Feedback Appreciated*
get rid of the cam and get a larger split. you will see a HUGE difference. i got done with doing a 383 stroker that went from a small 214-218 crane custom cam to a 236-236 can picked up 30 hp with a bad tune!! his afr was around 12.0. then he was so impressed he went to a t-rex 242-248. no dyno's # yet but WOW i was impressed on how much the car picked it. car is an animal 
On The Tree
Joined: Jan 2005
Posts: 112
Likes: 0
From: Boulder, CO
I've got a 238/244 in my 402, and while my peak hp is 20 more than yours, we have the same peak tq. At 3000rpm, you've got 50ft-lbs more than me, mine doesn't catch up until 4000rpm. I really wish I knew if they actually had it floored the whole time, or if they didn't get on it until 3500+.
I did get 27mpg on the highway recently, on a 60 mile trip, so I'd say you could go a lot bigger on the cam before it hurts your mileage.
Here's my last post on my car:
https://ls1tech.com/forums/dynamometer-results-comparisons/529648-final-s-my-402-a.html
Considering I have an LS6 intake and TB and people say I'd gain 20-30 going to a FAST90 (which you already have), I'd be really surprised if you didn't pick up at *least* 30hp with a bigger cam. In fact, yours is the only 402 I've seen dyno lower than mine, your cam must be holding you back quite a bit.
I did get 27mpg on the highway recently, on a 60 mile trip, so I'd say you could go a lot bigger on the cam before it hurts your mileage.
Here's my last post on my car:
https://ls1tech.com/forums/dynamometer-results-comparisons/529648-final-s-my-402-a.html
Considering I have an LS6 intake and TB and people say I'd gain 20-30 going to a FAST90 (which you already have), I'd be really surprised if you didn't pick up at *least* 30hp with a bigger cam. In fact, yours is the only 402 I've seen dyno lower than mine, your cam must be holding you back quite a bit.
Originally Posted by Trevor @ Texas Speed & Perf.
Actually that is the point where the car made it's best power. The a/f was moved around a little bit just to be sure. We were thinking a MS3 might be a nice swap without giving up much low end. It would still be a fairly small camshaft for a 402, but it should make good power..
FormerVendor
Joined: May 2006
Posts: 187
Likes: 0
Just a couple of comments here. I did the base tune. I have made a couple subsequent tweaks, and the car drives well in my opinion.
Regarding the dyno, we were supposed to take the car over to TSP on a Friday, but we were not able to work out a schedule with TSP. I left the WOT AFR and timing alone as I prefer to dial those in while on the dyno. Unfortunately, I was not able to be there when they did the pulls at TSP. I don't believe the AFR and timing settings information (i.e being stock) was relayed to Jason @ TSP. Although, it wasn't Jason's job to tune the vehicle. He did notice the pig rich AFR's and did an excellent job of dialing them in. Thanks Jason.
That was the only change on the dyno.
So, the car made 430/430 with only 20* of timing. I was able to confirm the low timing at WOT as I met up with Greg last week. My goal was to dial in the timing and compare the outcomes. The second dyno was not working properly, so we were not able to finalize WOT timing. We did get one good base run on the second dyno while scanning the vehicle and confirmed 20* at WOT.
I have no doubt there is more power in the engine.
However, Greg is going to be re-deployed to Iraq (for the third time IIRC) in the very near future. So, we might not have an opportunity to completely dial-in this setup until his return.
I don't believe there is anything physically wrong with the engine or car altough the CAI would help some.
BTW, we work with TSP all the time. Good bunch of guys that know their stuff.
Regarding the dyno, we were supposed to take the car over to TSP on a Friday, but we were not able to work out a schedule with TSP. I left the WOT AFR and timing alone as I prefer to dial those in while on the dyno. Unfortunately, I was not able to be there when they did the pulls at TSP. I don't believe the AFR and timing settings information (i.e being stock) was relayed to Jason @ TSP. Although, it wasn't Jason's job to tune the vehicle. He did notice the pig rich AFR's and did an excellent job of dialing them in. Thanks Jason.
That was the only change on the dyno.So, the car made 430/430 with only 20* of timing. I was able to confirm the low timing at WOT as I met up with Greg last week. My goal was to dial in the timing and compare the outcomes. The second dyno was not working properly, so we were not able to finalize WOT timing. We did get one good base run on the second dyno while scanning the vehicle and confirmed 20* at WOT.
I have no doubt there is more power in the engine.
However, Greg is going to be re-deployed to Iraq (for the third time IIRC) in the very near future. So, we might not have an opportunity to completely dial-in this setup until his return.I don't believe there is anything physically wrong with the engine or car altough the CAI would help some.
BTW, we work with TSP all the time. Good bunch of guys that know their stuff.
Last edited by ChrisS@sdpc; Oct 23, 2006 at 04:57 PM.
Thread Starter
Joined: Jul 2005
Posts: 531
Likes: 1
From: Texas, Europe, Iraq & Afghanistan
I truly appreciate all the feedback. In just over a week I'll be flying to sunny Iraq. When I return everything possible will be done to find the missing power - be it through timing, camshaft, intake or somewhere else and put it to work on the dyno. Gotta "MAKE IT HAPPEN" as we say in the military!
my best was 11.62 at 119 never been on a dyno and i had a ton of fueling issues,cant wait till next year,good luck in iraq man im an ex-marine was there for the first war.be careful make us proud.
On The Tree
Joined: May 2004
Posts: 104
Likes: 0
From: Denver CO.
I put down the numbers in my sig with a FlowTech Induction Street Sweeper cam. I have a stock ls2 block ETP stage II ported LS2 heads, ported FAST intake, Kooks 1 7/8s headers, spintech exhaust, tuned by me. With a little more dyno time, I could make 460. Here's a dyno chart.
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I made 471/416 on a heads/cam 346 in my old C5 with a Futral F-15 cam and unported Dart 225s.
I'd be very disappointed.
Honestly, I'd throw it back at the builder. They should have known better and had it built correctly the first time. Apparently they'd rather see you spend $$ upgrading parts and wasting time redyno-tuning.
With my car, it took 5 days for the setup and it left with nice horsepower.
I didn't have to buy more parts or ever go back for more tuning.
Mike
I'd be very disappointed.
Honestly, I'd throw it back at the builder. They should have known better and had it built correctly the first time. Apparently they'd rather see you spend $$ upgrading parts and wasting time redyno-tuning.
With my car, it took 5 days for the setup and it left with nice horsepower.
I didn't have to buy more parts or ever go back for more tuning.
Mike
FormerVendor
Joined: May 2006
Posts: 187
Likes: 0
I am confident there is nothing wrong with the engine. I have seen no indication of a problem when driving the car. The 430 #'s were made with a stock timing table maxing out around 20*. I believe the combination will put down 450/450 with a proper timing table. I have agreed to meet with Greg to finish the dyno tune for this setup. If I understood correctly, Greg chose the heads and cam, and he did so with fuel economy as one of his primary factors or concerns. The cam is 226/585/112. I don't believe this H/C combo on a 402 will make 500RWHP.
FYI, on a small cam (220/224 .567/.567 114) 402 setup, we made 534HP and 564TQ on an engine dyno which equates to ~ 454/480 at the tires. This engine had a little more compression as well as a vacuum pump. You can see the details here.
We will keep working with Greg to help him achieve his goal.
FYI, on a small cam (220/224 .567/.567 114) 402 setup, we made 534HP and 564TQ on an engine dyno which equates to ~ 454/480 at the tires. This engine had a little more compression as well as a vacuum pump. You can see the details here.
We will keep working with Greg to help him achieve his goal.
