NITROUS OXIDE ( nos / n2o ) advice forum

been and done rolling road today standard run no nos is 242.7 bhp and 264.9 torque, on nos it run 331.7 bhp and 416.4 torque that was with 200n 90f jet sizes so was very happy. they said i was running lean on bottom end and rich top end of the revs? what do you guys think any suggegstions? cheers john

Performance wise that sounds a decent result.

What car is it?

What fuel pressure does it run?

Do you have a bottle heater?

Do you know what the bottle pressure was?

hello trev its a celics gt4 engine in a corolla, dont no my fuel preasure yes it has a heater and the bottle preasure was at 900psi cheers john

Nice results
Have you run it down the strip yet ?

yeah it has run a 13.3@110mph i raced you at pod at the won meet you left me for dead as my gear selector cable came off when i shifted into 2nd lol

13.3@110mph impressive. Now you mention it, I seem to re-call. I can't wait to get back to the pod next weekend to test my new high flow set-up. My goal is 13's at 100+

all the best next weekend mate, im goin the saturday after for rwyb

I'll be there too as the next day is the BMW Show

great will see you there

Great result Jon

More to come yet I'm sure

cheers mate, yeah there will be alot more to come , a controller is next on the list

Had the bottle heater been on for a good length of time before you carried out the dyno run?

Can you post some pics of how you have it fitted please?

the heater was on about 30 min ish, on and off as it got to temperature it was then off for about 20 /25 while it got put on the rollers and we done the first run but the preasure did stay at 900psi will get some pics up tomorrow but the heater sits under the bottle if that helps for now cheers john

OK that rules out falling bottle pressure as the cause for the lean to rich swing.

Awaiting your pics of the front end to assist further.

here are some pictures of how its set up.

The fit looks about right, so that's not the problem.

It's an OLD system so have you replaced the nitrous filter since buying it?

Have you got a progressive?

yeah its had new filter in and they have both been serviced recently, its running fixed hit trev

That leaves me with one last option;

The jet sizes are a little too rich and the initial leanness is due to the nitrous reaching the engine first.

The lean to rich process is normal to some extent and the best solution to the issue, is to fit a Max Extreme and utilise the nitrous only delay feature and fit a smaller fuel jet.
A cheaper but less satisfactory solution is to increase the length of the nitrous pipe between the Pulsoid and the D-Block inlet.

thanks for the advice trev will save my pennies and get the max, will make the nos pipe longer for a quick fix this year, should i drop the fuel jet to an 80 its got a 90 at the moment

Good numbers. What revision is the engine? Any other mods other than the nitrous?

cheers mate its an st185 engine with st205 ecu conversion/blitz induction kit/3 inch exhaust with de cat/front mount intercooler/1 bar boost/uprated pump.

Yes an 80 should do the job but if you would like to monitor the AFR whilst in use, we can supply you with one of these;
http://www.noswizard.com/index.php/nitr ... sor-2.html

Plus a gauge to do that.

great cheers trev