Car made 100hp less than it should have

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TylerTJ
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Car made 100hp less than it should have

Post by TylerTJ »

Hello! This is my first post here, but I’ve been looking through these forums for a good while now.

Yesterday, I got my car dyno tuned, and was very surprised with the power it made. At 15 psi, the car only made 225 horsepower. At 15 psi, I was expecting something much stronger along the lines of 300-350, based on many other users dyno sheets.

I am looking for suggestions of things to look for that could be my problem. Spark, fuel, air all good. There are no misfires, and the engine runs really smooth with great oil pressure and no weird noises. I did a compression test a couple months ago before the turbo was installed and everything was good. It still sounds fine and runs healthy enough to make me believe that compression is not an issue. I will check this soon though.

Other than that, I am stumped. Please do drop your suggestions below. Dyno sheet attached

Build list:
cx racing turbo kit
Megasquirt
Dw800cc injectors
Walbro 255 fuel pump
Perrin boost controller
Wideband
1989 NISSAN 240SX.pdf
(242.78 KiB) Downloaded 10 times
modulation
240sx Wannabe
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Re: Car made 100hp less than it should have

Post by modulation »

1. Have you done a test for boost leaks?
2. What is your spark plug gap?
3. What turbo are you running?
4. What is your timing at 15 psi?
5. At what point do you hit 15 psi?
6. Do you still have cat?
7. DO you have 3" cat-back?

Also are you ka24e or did you swap to a ka24de?
TylerTJ
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Re: Car made 100hp less than it should have

Post by TylerTJ »

modulation wrote: Sun Sep 11, 2022 5:02 pm 1. Have you done a test for boost leaks?
2. What is your spark plug gap?
3. What turbo are you running?
4. What is your timing at 15 psi?
5. At what point do you hit 15 psi?
6. Do you still have cat?
7. DO you have 3" cat-back?

Also are you ka24e or did you swap to a ka24de?
1. Yes, no boost leaks.
2. .028
3. CX Racing 50mm t4
4. 11 degrees btdc
5. 4500 rpm
6. No
7. Yes

Still the original single cam
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OnTheChip
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Re: Car made 100hp less than it should have

Post by OnTheChip »

You might look into your cam specs. Stock NA cams generally have too much overlap for effective boosted power.
modulation
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Re: Car made 100hp less than it should have

Post by modulation »

I'm no expert at ka24e but from what I remember reading it really needs a cam to get much benefit out of turbo.
I also think it benefits much less from being turbo since it can't breath as well.

The cx turbo might be to blame too, but I'd start with an aftermarket camshaft.
tuzzio
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Re: Car made 100hp less than it should have

Post by tuzzio »

While this does seem low, the number is really only for reference only. The graph is the important part.
If the car runs well, and the engine is healthy, it is what it is. What did your tuner say?
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p00t
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Re: Car made 100hp less than it should have

Post by p00t »

Why not post some pictures of your setup?

Without any other information I would suspect the turbo and wastegate are just not good. If the wastegate is leaking or the turbo is crappy you will have a super laggy system. BOV should be tightened all the way to see if there is a difference and connected back to pre-turbo, post-MAF. How is that shaft play on the turbo now that you have run it in?
Current Experiment: Project Twin-Charge 2022
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