help with my set up 402 stroker
08-12-2007, 12:16 PM
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help with my set up 402 stroker I've got a 01 camaro with a 402 stroker turbo 400 trans only a 3200 converter ford 9" rearend 370 gears. First we'll start out as it's a ls2 block eagle crank eagle rods diamond pistons afr 225 heads fast 90 intake holley 90 TB, 85mm maf 42 lbs svo injectors kooks 1 7/8 headers y pipe with a cutout. It's about 11.5 to 1 compression texas speed 257/266 113 don't remember the exact lift. My problem is it only made 430 to the tires. I would think it should make more than that, I took it to the track and it went 11.40 at 119 with a 1.6 60 foot on motor and I sprayed a 150 shot it only went 10.70 at 125 with a 1.5 60 foot. Both of these were off the foot brake
On nitrous it only picked up 65 horse on the dyno. The car weights 3650 with me in it. It is pretty much full suspension car. It only has a racetronics fuel pump in it and it seems to drop fuel pressure to about 52 psi why am I losing fuel pressure do I need a inline pump to hold pressure? Why is it not making power it should make any suggestions? do I need better exhoust? tune seems good it drives on the street great. a/f is at 12.9 and total timing is 26 and 6 degrees pulled on nitrous.
Any help would be great
Thanks pete
On nitrous it only picked up 65 horse on the dyno. The car weights 3650 with me in it. It is pretty much full suspension car. It only has a racetronics fuel pump in it and it seems to drop fuel pressure to about 52 psi why am I losing fuel pressure do I need a inline pump to hold pressure? Why is it not making power it should make any suggestions? do I need better exhoust? tune seems good it drives on the street great. a/f is at 12.9 and total timing is 26 and 6 degrees pulled on nitrous.
Any help would be great
Thanks pete
08-12-2007, 12:28 PM
#2
who tuned the car? somehting is definately up if a 150 shot only gave you 65 more rwhp. you trans and 9" are definately sucking up the power but I agree your setup should be making alot more than what you are. Your track mph backs up the low dyno numbers too. Try figuring out the DA was that day. Knowing what the weather & track elevation was would help.
08-12-2007, 02:42 PM
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430 is not too bad for a th-400. Well depends on how it's built I guess.
Yeah definetly you have a fuel pressure problem. It shouldn't drop below 58-59. My guess is you aren't getting enough fuel on the shot. I would invest in a better fuel sending system. When I had a 150-shot on my cammed f-bod, I used the 175 fuel pill and the 150 nitrous pill and my pressure never dropped. It also depends on what nitrous sysyem you have. If it is a nozzle setup, then fuel pressure drop will be a big issue, but it should recover quickly. If it is like a maf setup from NX, it shouldn't drop. I think they make an accumulator for the nozzle setup to prevent the pressure drop. Also the combination of the th-400 and the converter, depending on how the converter is built, can eat up a lot of hp. I believe a 9-in. eats some as well. I'll bet if you stick a 6-speed in it, and a 10-bolt, you would see about a 75 hp gain. Just saying this for sake of comparison.
Yeah definetly you have a fuel pressure problem. It shouldn't drop below 58-59. My guess is you aren't getting enough fuel on the shot. I would invest in a better fuel sending system. When I had a 150-shot on my cammed f-bod, I used the 175 fuel pill and the 150 nitrous pill and my pressure never dropped. It also depends on what nitrous sysyem you have. If it is a nozzle setup, then fuel pressure drop will be a big issue, but it should recover quickly. If it is like a maf setup from NX, it shouldn't drop. I think they make an accumulator for the nozzle setup to prevent the pressure drop. Also the combination of the th-400 and the converter, depending on how the converter is built, can eat up a lot of hp. I believe a 9-in. eats some as well. I'll bet if you stick a 6-speed in it, and a 10-bolt, you would see about a 75 hp gain. Just saying this for sake of comparison.
08-12-2007, 04:37 PM
#6
The 119 mph N/a is what bothers me the most. And that's with a soft 60'. She's heavy but still a 402 even at that weight should be able to break 122-125. Don't tell me that's with a lock up converter.
08-12-2007, 07:28 PM
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It's a nx nozzle kit and I tried playing with the jets, the weird thing is when it's jetted for a 150 the plugs look a little lean but not bad, if you go up 1 on the fuel the plugs look perfect. I just don't know why it's dropping fuel pressure it drops like that on motor to.
Originally Posted by slow14U
430 is not too bad for a th-400. Well depends on how it's built I guess.
Yeah definetly you have a fuel pressure problem. It shouldn't drop below 58-59. My guess is you aren't getting enough fuel on the shot. I would invest in a better fuel sending system. When I had a 150-shot on my cammed f-bod, I used the 175 fuel pill and the 150 nitrous pill and my pressure never dropped. It also depends on what nitrous sysyem you have. If it is a nozzle setup, then fuel pressure drop will be a big issue, but it should recover quickly. If it is like a maf setup from NX, it shouldn't drop. I think they make an accumulator for the nozzle setup to prevent the pressure drop. Also the combination of the th-400 and the converter, depending on how the converter is built, can eat up a lot of hp. I believe a 9-in. eats some as well. I'll bet if you stick a 6-speed in it, and a 10-bolt, you would see about a 75 hp gain. Just saying this for sake of comparison.
Yeah definetly you have a fuel pressure problem. It shouldn't drop below 58-59. My guess is you aren't getting enough fuel on the shot. I would invest in a better fuel sending system. When I had a 150-shot on my cammed f-bod, I used the 175 fuel pill and the 150 nitrous pill and my pressure never dropped. It also depends on what nitrous sysyem you have. If it is a nozzle setup, then fuel pressure drop will be a big issue, but it should recover quickly. If it is like a maf setup from NX, it shouldn't drop. I think they make an accumulator for the nozzle setup to prevent the pressure drop. Also the combination of the th-400 and the converter, depending on how the converter is built, can eat up a lot of hp. I believe a 9-in. eats some as well. I'll bet if you stick a 6-speed in it, and a 10-bolt, you would see about a 75 hp gain. Just saying this for sake of comparison.
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08-12-2007, 07:32 PM
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Originally Posted by tektrans
The 119 mph N/a is what bothers me the most. And that's with a soft 60'. She's heavy but still a 402 even at that weight should be able to break 122-125. Don't tell me that's with a lock up converter.
08-12-2007, 10:03 PM
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I'm running a very similar setup to you. I just had the car re-dynoed, and put down 457 HP. Before this tune I ran a best MPH of 127, but only ran that once, and all other runs the same day were 126. My car weighs 3550.
I would address the fuel issue. Maybe you have a pinched wire on the pump. My presure with a Walbro 225 is 60 lbs. Maybe even change out the pump, then follow up the line, making sure the injectors are fine, etc.
I would address the fuel issue. Maybe you have a pinched wire on the pump. My presure with a Walbro 225 is 60 lbs. Maybe even change out the pump, then follow up the line, making sure the injectors are fine, etc.
08-12-2007, 10:12 PM
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Originally Posted by Black Sunshine/ 00SS
I'm running a very similar setup to you. I just had the car re-dynoed, and put down 457 HP. Before this tune I ran a best MPH of 127, but only ran that once, and all other runs the same day were 126. My car weighs 3550.
I would address the fuel issue. Maybe you have a pinched wire on the pump. My presure with a Walbro 225 is 60 lbs. Maybe even change out the pump, then follow up the line, making sure the injectors are fine, etc.
I would address the fuel issue. Maybe you have a pinched wire on the pump. My presure with a Walbro 225 is 60 lbs. Maybe even change out the pump, then follow up the line, making sure the injectors are fine, etc.
08-13-2007, 04:05 PM
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Originally Posted by 1_bad_ss
Was that time on motor or nitrous. My pressure at idle and cruising is 61 and if I get on it hard it just starts dropping
The convertor that you have would actually give you a higher # that most,. because it is tighter, and yes, porting the FAST will give you more power, but focus on your current problem.
My cam is on a 114 ls, but not as large as the one that you have. Other than that, we have the same heads, block, injectors, intake, tranny... If anything you should be putting down the same or more power as I am. If not, then your MPH should be at least in the 125-128 range.
08-14-2007, 09:24 AM
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Originally Posted by GS WS6
This is not your main issue, but that cam is WAY to big........
Really? So with my 258/262 on a 110 I'm overcammed? How much faster than 9.82 will I go by switching to a smaller cam?
08-14-2007, 09:28 AM
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Originally Posted by 1_bad_ss
It's a vig. converter and the fast is ported also
Then you have a real problem somewhere. Do a leak down test and a compression test as a process of elimination. Do you have a dyno graph to post up? Your valve springs could be the cause. Also what rockers are you using? With your combo I went 10.17 with stock rockers with my 243 heads.
08-14-2007, 09:39 AM
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Originally Posted by ONEBADWS6
Then you have a real problem somewhere. Do a leak down test and a compression test as a process of elimination. Do you have a dyno graph to post up? Your valve springs could be the cause. Also what rockers are you using? With your combo I went 10.17 with stock rockers with my 243 heads.
Thanks
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08-14-2007, 10:04 AM
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If I remember right my springs were 195 and 420lbs, my cranking compression is 280 but I have 14.5-1 comp and pistons are .020 out of the hole. I would expect 230 or more cranking compression. I would replace your fuel pump with a racetronix setup. I run there dual intank pump setup just for my motor, base fuel press is 68-70 psi.