Nitrous Oxide - 150hp jets = 80rwhp?

had my car on the dyno last night at was somewhat dissapointed in the n2o numbers. Only 80rwhp with 150hp jets. Heres a short run down,

NX bottle
Cold fusion 'noids
HSW 78mm plate
ngk tr6's @ .35
900-1000psi bottle pressure
21* timing on the top with 0*KR
11.6-11.8 AFR

My question is simple what would be the most likely cause of the low hp? if there is any other info you need pls ask

Thanks

What's the rest of the car have done? What tranny, exhaust, what else is done to the motor, etc.etc.

what jet brand r they? becouse im pretty sure nx jets r for whp! if they r not nx jets then they might not be mesured the same!

What's the rest of the car have done? What tranny, exhaust, what else is done to the motor, etc.etc.

It has a built 4l60 3800 yank locked, pace setter LT and 3in back to an open cut out, the rest of the motor is a 216/224 cam patriot s2 heads, 78 fast p&p TB, lid, the rest of the bolt ons.. stock bottom end

what jet brand r they? becouse im pretty sure nx jets r for whp! if they r not nx jets then they might not be mesured the same!

They are the HSW stainless jets, which i believe are rated at whp

what # jets were they?

I had a similar question....My NOS brand jets for 100 shot only gained me 57 RWHP

It has a built 4l60 3800 yank locked, pace setter LT and 3in back to an open cut out, the rest of the motor is a 216/224 cam patriot s2 heads, 78 fast p&p TB, lid, the rest of the bolt ons.. stock bottom end


When you say the converter is locked, do you mean that it is always locked or was it only locked on the dyno? The reason I ask is that I saw a big difference in HP #s on the dyno between my converter being locked and unlocked on the spray. I had a 42 HP discrepency between locked and unlocked on the spray with my 3400 converter.

When you say the converter is locked, do you mean that it is always locked or was it only locked on the dyno? The reason I ask is that I saw a big difference in HP #s on the dyno between my converter being locked and unlocked on the spray. I had a 42 HP discrepency between locked and unlocked on the spray with my 3400 converter.

it was only locked on the dyno... did you have higher numbers when locked or unlocked?

what # jets were they?

i cant remember off the top of my head, but they were very simmilar to the 150hp jets i was running with my cold fusion nozzle.




also a long time ago i had dyno'd the car with the cold fusion single nozzle and only got 70rwhp with the 150hp jets in.

Could this mean my selenoids may be goin out? or possibly the bottle not flowing what it should?

If one system did it and now the other is check these things out.

1. Actual jets in plate- (Orfice size)
2.Orfice size on the solenoids

If you have the correct orfice size jets and the solenoids are over a .063 on the nitrous you may be blowing through the convertor.
Dave

That's what I was thinking, it sounds like you are blowing through the converter.

Wha gear/tire size are you running? And what MPH were yor running at the end of the pull?

Also slicks will rob some power on the dyno, not as much as you are missing but it could be part of the problem if you were running slicks.

If one system did it and now the other is check these things out.

1. Actual jets in plate- (Orfice size)
2.Orfice size on the solenoids

If you have the correct orfice size jets and the solenoids are over a .063 on the nitrous you may be blowing through the convertor.
Dave

Thanks ill check out the solenoid orfice in a lil and post it up. What exactly is mean by "blowing through the converter"?

That's what I was thinking, it sounds like you are blowing through the converter.

Wha gear/tire size are you running? And what MPH were yor running at the end of the pull?

Also slicks will rob some power on the dyno, not as much as you are missing but it could be part of the problem if you were running slicks.

3.73 rear gear and 275/45/17 nitto 555 tire. i dont exactly remember the mph but i believe it was in the 13x range

Id say solenoids, i gained 101-103hp/tq from the HSW plate, using NOS solenoids and the 100 shot no2 and 125 feul

I always had a hunch that you weren't getting a full 150 to the wheels. Once you figure this out you're going to be in the 10's for sure.

Danny, i would check the solenoids. They might be a restriction.

Blowing through the convertor is the same terminallogy as pushing through the convertor.
Basically the convertor not delivering the power to the drive train. Its comparable to a slipping clutch.
Dave

If the converter is locked on the dyno though, then in theory it shouldn't be blowing through the converter though correct? Doesn't mean it can't if the clutch material is worn or not up to the power though.

Im no tranny expert. This would be a area better for Ellis. However Locked or unlocked if the convertor can not handle the power it will still push through it.
Dave

I have seen more then one 'Locked' converter get blown trough on the Dyno.

Post up the graph's so we can get a better I dea what is going on. you will probably have to look at the in speed instead of RPM.

Post the up for us!

This converter and tranny only have about 2000 miles on them.. if that helps

I have seen brand new convertors off the shelf have issues.

Like Ellis said post up a dyno graph.
Dave

Here is the same graph one by rpm and one by speed.. the window switch is set to activate at 3800

http://i72.photobucket.com/albums/i187/SnakesRslow/Danny_Dyno.jpg

http://i72.photobucket.com/albums/i187/SnakesRslow/Danny_Dyno2.jpg

Here are the results of my three dyno runs. The first two were done with the converter locked and the third was with it unlocked. All three runs were spraying a 125 wet shot. Notice there is about a 40HP difference between locked and unlocked. All mods are listed in my sig. I did have a N/A dyno run with the same mods on a different dyno and I dyno'd around 270 RWHP with the converter unlocked. I was definitely happy with the 425 RWHP dyno run (locked), but not overly impressed with the 383 (unlocked) run. However it is still much better than 270:) I probably will get another N/A dyno just to have another set of #s to compare, because 270 seems low.

http://i124.photobucket.com/albums/p25/dsimons2001/dyno.jpg

Can anyone tell me from the graph's if it was blowing through the converter?

Damn danny. With those numbers on spray i would be able to run with you from a roll! But we know what would happen from a dig

Come on i know there's someone out there that can help me out... All i need to know is if its blowin thru the converter er not

If it helps any I was running an hsw kit with the small noids and 150 hp jets and only picked up 90 hp on the dyno with the converter locked. THis is after I made 410 na. I switched nozzle and jets, (different brand) and it was night and day, good enough for 10.84 @126 bouncing off the rev limter in first gear with a 100% stock suspension drag radial car. I would be leaning towards the nitrous setup, maybe converter but I didn't change my converter and it was night and day! Good luck

If it helps any I was running an hsw kit with the small noids and 150 hp jets and only picked up 90 hp on the dyno with the converter locked. THis is after I made 410 na. I switched nozzle and jets, (different brand) and it was night and day, good enough for 10.84 @126 bouncing off the rev limter in first gear with a 100% stock suspension drag radial car. I would be leaning towards the nitrous setup, maybe converter but I didn't change my converter and it was night and day! Good luck

hmm im on the 78mm plate kit and the stainless steel jets tho... i have a feelin its probably my little cold fusion solenoids

Sorry I have not had time till now to look over the board. I do not really see a issue with a slipping convertor on the graph.

I would start with the nitrous system. Do a flow test on the parts you have. If the companies you bought the parts from can not walk you through the correct procedures on how to do this give one of our techs a call or shoot me a pm. We have the knowledge to help you and will be happy to do so.
Dave