Nitrous Dyno Today

[LGAFF]

If all goes well, the 90 will be on the dyno with a 75 shot of nitrous today.

Last week I tried to dyno my 2005 Mercedes SL600, the electronics didn't cooperate....no tach and then the car kept downshifiting even in dyno mode....it did manage to give us a reading of 479rwhp before it downshifted....so its north of 479....which puts it over 600 crank.

When I dynod the 90 Z car after the engine build it put down 441 RWHP; however on this particular dyno with my last intake test it was 426RWHP....both just motor.

Going to run on motor, then try the juice....

[XfireZ51]

Make a vid of it.

[LGAFF]

https://uploads.tapatalk-cdn.com/20170806/2fd529713bf75fb2c63082291c8e8e6c.jpg


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[Top Toy]

Good luck! Got any bigger nozzles? 😉

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[BigIke]

Standing by!

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[LGAFF]

Well on motor the car made 424.5RWHP but it was insanely fat at 10.5-11.1 AFR....there were point at low RPM it was at 10.1.

We tried the juice, but oddly the car went lean but did it pick up power; Holy Christ.....he didn't print the RPM but when you look at when he shut it down it was making 363RWHP......without NOS it was making 283 at that same point.

Ill be back

[tpepmeie]

Are you disconnecting the air duct when on motor? Down on power and rich, maybe the duct is collapsing?


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[LGAFF]

I don't think that's it.....wonder if its the FPR.....150K miles on it

Its a Jerrys gasksets Duct

[tpepmeie]

Air filter new and clean? Doubt it's the FPR. I'd try to think of things which would restrict airflow. If the fueling was right before.


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[LGAFF]

It's was pig rich on motor 10.5 11.1


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[LGAFF]

Pulled the jets and had them correct.....fuel side was dry.....but might have been from sitting, could smell gas.....wonder if solenoid was not opening gas, I would think pumps should be able to supply the correct flow

[Ccmano]

I thought for sure this was going to be the next episode of the Big Bang Theory. Anxious to see how that bottom end holds up with nitrous on a 125k+ mile engine.

:happy1:

H
:cheers:

[LGAFF]

Was looking through a few pics I took when we were looking at the dyno results

Was making 428ftlbs at 4K RPM....also saw it was at 403RWHP at 5K

AFRs in the 14 range...yikes

[ssrszz4]

Of all engines this might be the one that likes Nos the most looking forward to further results.

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[XfireZ51]

Was looking through a few pics I took when we were looking at the dyno results

Was making 428ftlbs at 4K RPM....also saw it was at 403RWHP at 5K

AFRs in the 14 range...yikes

No not good at all. BOOM!

[LGAFF]

Well I have fuel getting to the solenoid, I know Solenoid has worked before on the fuel side......and the solenoid controls both the NOS/Fuel so we know it works at least in part. So we have the following possibilities

1)Fuel side of solenoid is not working

2)Jet is too small....which would be odd as typically they Jet it rich

3)Pumps cannot handle the dip in pressure and maintain what I need

[RussMcB]

Are you able to monitor the fuel pressure while the car's running? That might help you narrow it down.

[LGAFF]

I did not. We did test it without nitrous and fuel from the jet only and the car ran leaner. So thinking it's the pump


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[RussMcB]

I think somewhere in the forum someone had a picture of a pressure gage temporarily connected to the test port, with a long hose so they could read the fuel pressure while driving (gage taped to windshield). You could do a brief test like that without a dyno.

Or you could go ahead and install a permanent fuel pressure gage. I did that when I first got my car to help troubleshoot its issues. Mine is located on the A pillar using a generic plastic pod. It's kind of nice having it. Might be useful some day, especially for a situation like yours.

Good luck. Looking forward to reading your progress and results. Sounds like it will be awesome.

[XfireZ51]

I did not. We did test it without nitrous and fuel from the jet only and the car ran leaner. So thinking it's the pump


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Lee,

Something for u to consider.

http://www.chevyhardcore.com/tech-stories/power-adders/protecting-our-e85-build-with-aems-flexfuel-wideband-failsafe-gauge/?utm_source=rss&utm_medium=rss&utm_campaign=protecting-our-e85-build-with-aems-flexfuel-wideband-failsafe-gauge

[Hog]

I thought for sure this was going to be the next episode of the Big Bang Theory. Anxious to see how that bottom end holds up with nitrous on a 125k+ mile engine.

:happy1:

H
:cheers:
We've got guys North of 700hp on LT5s, so a 75hp shot on an LT5 really shouldn't affect much. Its only 9hp a hole.
Of course if you detonate any cylinder, it doesn't much matter how much power you're making, you can break parts. My comments are relegated to a functioning engine with proper conditions for combustion.