AX JP4 turbo on NOS NOW 6 SPEED - Page 22 - Saxperience

tweeqd · 22nd February 2012, 10:32

248bhp and 236lbs/ft @20psi, it made 220bhp @15psi so its being strangled over 1 bar
i think the exhaust manifold is holding it back as it hits 5k and the power just drops off

. ill make a new manifold with bigger primarys and longer runners next winter so i can at least use the car this year

due to my gearing it under reads the power figures on the rollers, i have a 0.8 4th gear so the figure is about 20% off the real power so with a 1.1 4th its closer to 300bhp@fly but has alot more to come as the turbo should make power up to the redline, i didnt want to run the water/meth untill the other issue is sorted but it should still be fun to drive this year

it took 3 of us sat on the slam panel to stop it lifting out of the rollers lol

dannygti · 22nd February 2012, 10:55

Sounds wicked mate, when you can get some more revs from it, it will be RAPID

tweeqd · 22nd February 2012, 11:02

Jamie said it should be mental, he was very suprised it made the power it did with the problem

cant wait untill march now so i can tax it and drive it

dannygti · 22nd February 2012, 11:08

Quote:

Originally Posted by tweeqd

Jamie said it should be mental, he was very suprised it made the power it did with the problem

cant wait untill march now so i can tax it and drive it

I know for certain it will be ridiculous lol..

Will look forward to seeing it at pod

blackie_2k5 · 22nd February 2012, 14:34

Are you running standard size valves or are they bigger?

Will still be mentally quick how light it is at that power lol

tweeqd · 22nd February 2012, 14:49

standard size valves mate but cut back with a heavily ported head

i think it weighs in at about 800kgs at the mo

it will be at the pod at the end of march

stevo67 · 22nd February 2012, 14:53

Like this,good luck with it mate.

tweeqd · 22nd February 2012, 23:34

Sophia_Bush · 23rd February 2012, 00:14

yeah around 5.5k can see it drop off but still martin you'll be beasting pretty much anything that gets in your way

dannygti · 23rd February 2012, 00:16

Not sure what to make of the graph Martin, is that as much as you revved it or did you rev it out? What's the rev limit set at?

miamibluebaby · 23rd February 2012, 00:50

Soo it goes from 70bhp to 230+bhp in 1600rpm, not suprised its trying to take off haha, still mental power, nice hot mani to

tweeqd · 23rd February 2012, 08:13

rev limit is 7.5 Danny and yes if revd right to the limit but the power just went down

blackie_2k5 · 23rd February 2012, 13:54

what was the injector duty?

adamskiTNR · 23rd February 2012, 14:18

As the above, looks like fuelling, as that is a serious drop off. On that graph did you try to run it up to the redline, and that was the result?

tweeqd · 23rd February 2012, 16:40

yes adam it was run up to the limiter but as soon as it hit 5.5k ish you could see the power drop off

not sure what they were running at

jamie did say before he started he didnt think 390cc's were big enough, and now you say pump i have a sytec one thats only rated to 300bhp

blackie_2k5 · 23rd February 2012, 16:49

Quote:

Originally Posted by tweeqd

yes adam it was run up to the limiter but as soon as it hit 5.5k ish you could see the power drop off

not sure what they were running at

jamie did say before he started he didnt think 390cc's were big enough, and now you say pump i have a sytec one thats only rated to 300bhp

im running 440s at about 60-70% iirc? at 218bhp (ill have to check)

id say your injectors would have been maxxed out at that power???

EDIT- the 337 ones i got off you were hitting 80% at 163bhp when i was using 10psi..but it was overfueling alot aswel

crisppug · 24th February 2012, 12:19

good progress tweeqd,im pritty sure you need bigger injectors.

when are you hoping to start some track days?

tweeqd · 24th February 2012, 18:41

not sure if i will track this, its a bit laggy i hate to say it but i might look at a .48 exhaust housing

ill be at the pod in march though

Sandy309 · 24th February 2012, 18:45

What's the sudden dip at 2500rpm? Very odd!

tweeqd · 24th February 2012, 18:49

i was hopeing you would se this sandy (although i guess you need more info than just the graph)

not sure on the dip, the powere band of the cam is 3-7k, i didnt know what to make of the dip or the suddon power loss

it will be on the rollers next weekend at surrey RR so ill see if the dip at 2.5 is there on their rollers

i took it out for a drive yesterday and i need 4 pots lol, my master cyl has gone aswell so was a bit scary but once on boost its just mental, it still had the shit tyres on i had on for mapping so had no grip but christ it fast.

its a bit too laggy for the track and road but should be ok on the strip, i might look at swapping to a .48 housing, i know it will loose a bit of power but that wont affect it too much lol