The V8 Owners Forum -

I managed to blag my way in to a Mazda RR day at Martins place today.

She ran 335 hp with 468 ft/lbs on just 7psi of boost. I set the ign at 19 degree's all in.

Thats only 65bhp off my nitrous power when spraying a 300 shot
And the blower can do double this if needed.

Thats some good figure's perry, what CR is that ?

Its 9.3 something as standard but has low comp pistons fitted.

And the pistons are Omega forged items which have stood up to so so much abuse over the last 3 years ..

thats a poop load of torque

any chance of posting the graph?

Excellent result Perry

I blagged my way into an Audi TT RR day once. Very funny
Did they make you wait till last?

I reckon a 100 shot under that blower will see you breaking records again

Impressive amount of torque Pel!!

Regards Ged

Thanks Ged!!

She used to run more torque than that with the big hit of nos. But that was quite aggressive on the dyno. She would spool up gently until she went full pedal as the nos came in and then the torque curve went vertical up to 550 ft/lbs with 402 hp showing. And the bloody flames from the exhausts were mental.. With the blower she is more sedate now so I'm hoping I can repeat the same figures with a bit more boost and a small shot of gas on the new direct port system. If I can change the drive pulley on the blower for a smaller one to get me to 10 psi of boost at 5000 rpm I hope to add just 15hp per cylinder of nitrous to get me a new PB on the 1/4 mile. But this wont be chaep as I now have to fit a high pressure fuel feed with a new tank and a regulated return setup.

No point in trying to spray 6 psi of fuel into a manifold that has 10psi of pressure in there eh ??


Perry

mgbv8 wrote:Thanks Ged!!

She used to run more torque than that with the big hit of nos. But that was quite aggressive on the dyno. She would spool up gently until she went full pedal as the nos came in and then the torque curve went vertical up to 550 ft/lbs with 402 hp showing. And the bloody flames from the exhausts were mental.. With the blower she is more sedate now so I'm hoping I can repeat the same figures with a bit more boost and a small shot of gas on the new direct port system. If I can change the drive pulley on the blower for a smaller one to get me to 10 psi of boost at 5000 rpm I hope to add just 15hp per cylinder of nitrous to get me a new PB on the 1/4 mile. But this wont be chaep as I now have to fit a high pressure fuel feed with a new tank and a regulated return setup.

No point in trying to spray 6 psi of fuel into a manifold that has 10psi of pressure in there eh ??


Perry

What pressure is your pump capable of ? You could just fit a boost referenced FPR. £45 will get you one. But yes it will need a return line. Although some people do a wee sneaky and return back into the pump intake as opposed to a proper return into the tank.

Or if you are fuel injected with enough injector....just use a dry shot ?

My fuel pump will only make 12 psi Stevie!!

I have a 044 pump and reg ready to fit.

I took it back on the rollers today !!!

This time with the carb jetted out to the max and the boost at 10psi.

Final result was 351hp with............... 501 ft/lbs of torque

The fuel was as I wanted it at 0.78 (11.4 afr) all through the pull from 1800 rpm up to 5500 rpm where it went to 0.85 (12.5 afr) up to 5700 rpm where the run ended.

This was the sweet spot for todays session.

I tried another pulley with 1 bar of boost all the way through the run and the fuel was almost identical. But the power and torque was lower? I tried this with 3 different ing timing settings and the runs were all very similar. I noticed that the blower body was very hot as well.

I decided to go back to 10 psi and add a small shot of nitrous for charge cooling. This was when i noticed my slicks had been spitting rubber all over the place. So i called it a day and can go to the pod next weekend with a new blower only tune to work from.


I was actually intending to only run the blower at 10 psi so as not to strain it too much and add nos as a cooler anyway. It cost a lot so I dont want to thrash it


I'm thinking that a 50-75 shot of gas on top of the blower which gives me the 350hp at 500 of torque should produce something like 410-430 hp with around 540 ft/lbs....

OR!!
A mid to low 10 on the 1/4 mile with hardly any nitrous

nice one mate,
looks like i wont see her run down the 1/4 next weekend, been a poop weekend for me,
clutch still not done and to top it off tonight taking the car back home the screen got taken out by a pidgeon

Hi Pel,

Great results mate, cant wait to see it run next weekend

Sorry to hear you wont be there Tony

Cheers John

Coops!!

You will just come in the family barge wont you??

i may be there in the cappa now mate, but wont be racing her as after paying out for the screen this coming thursday i cant afford the fuel to come up race and then back,

Nice sticky surface at the Pod I reckon Perry!

If Mike reads this he may confirm or correct me, but I think N20 has almost double the effect if you are spraying it into a hot charge, so a 50 shot could make a good 75bhp+ as it cools the charge and you still get the extra oxygen, you might want to retard the timing a little more though still.