got the fd dynod today

[Grizzly]

Power is a function of torque times rpm, so as both rpm and torque increase you get big power increases, once at peak torque you only get power increasing with rpm.  From 7000 rpm up to 9000 this engine has a pretty level torque curve.  .

Yeh i get that, but why is the Torque Figure 60% of the HP? that seems a big gap? For example i have ALLOT less power i grant you but my Torque is 80% of the HP? what i was trying to say is that down to running Huge ports or Tuning or its just the way it goes when you run big hp?

Out of intrest do you have the Boost map? Does it hit Target at 7k?

[Grizzly]

Did you do a 10k Pull that motor must be a work of art inside to be able to take nearly 800rwhp and 10k. Well played sir.

[Will66]

I\'d say it has ports for high rev power and a big turbo that reaches peak boost at 7k and holds it to 9k, the motor is capable of running that fast.  Since peak boost means peak torque the fact the power is so much higher than the torque is simply a function of its ability to rev so high.  

In fact judging by the peak power figures I\'d say that motor has done its work in being the fastest street rotary in Europe, 8.82 second 1/4 mile.  About as good a drag run as you\'ll see in a street car ever.

8.82 second 1/4 mile RX7

Without knowing your setup this is just speculation, but I\'m guessing you\'re running much less extreme ports and a lower rev limit.

[Grizzly]

Well yeh i know James and presuming thats his J Port you dont have to show me Video\'s of it.

It is class that he can still drive it to meetings one of the few True "Street" drag cars with mot etc not only that he says its not bad to drive on the road too just must be a little Diffrent.

[Will66]

I\'m sure you\'ve seen the video, I just think it\'s very cool.  I like that it is street driven.

[Grizzly]

I\'d say it has ports for high rev power and a big turbo that reaches peak boost at 7k and holds it to 9k, .

Well that’s usually a Knock on effect when you go for Big Power, a good engine builder will make it develop all its power in its Usable band.

I\'m just interested in Porting, thing is i know very little about Drag cars apart from what i\'ve picked up from frends in the US, they are not that Bothered about Velocity and much more interested in Volume (the complete opposite of me) the only time a drag car would need to Spool/Not in there power band is on the line and that’s why you see them preload to get the Turbo spooling up before Launch Every thing must be Huge

[JayDee]

The step at 7 was due to over fueling, this was sorted for the next run, but the dyno could not take the increase, so no readings. On the road full boost is 5.5k but on the dyno it is just before 7!!.
The engine is just a full bridge, yes the top end certainly gets your attention.

[JayDee]

I think the dyno may not be able to load the car up enough and why full boost is higher on the dyno, I presume this may lower the torque, although I would expect a lower hp to torque ratio with our setup,

[Grant Monkhouse]

The step at 7 was due to over fueling, this was sorted for the next run, but the dyno could not take the increase, so no readings. On the road full boost is 5.5k but on the dyno it is just before 7!!.
The engine is just a full bridge, yes the top end certainly gets your attention.

I was thinking it was fuel problem but didn\'t want to say as I don\'t know much about these things. It\'s good how you are still on a conventional bridge port, rather than going through the water jacket etc although Robs car is great and sounds weird in his burn out.

Do you think you and James would benefit from going further with the bridges? Or would you prefer semi pp or full pp?

[Grant Monkhouse]

I think the dyno may not be able to load the car up enough and why full boost is higher on the dyno, I presume this may lower the torque, although I would expect a lower hp to torque ratio with our setup,

Have you though of getting the engine onto an engine dyno? Eliminates chance of breaking the gear box.

Do you think James will want to step up to FacMod? Keep the IRS but go to a proper drag box?

[JayDee]

To be honest, we have a semi pp waiting for it, but we are making more than enough on the bridge without turning the boost up, so the engine is staying as is, his 8.8 was done at 1.8 bar it has run up to 2.5 but not on the strip!!
Once we have the new box, then the launch control or second lower soft cut rev limiter can be utilized to help with launching the car with boost.

[Grant Monkhouse]

Soft cut, is that where the spark is cut one at a time to limit the revs rather than the whole lot? Will the box hold the 2.5 bar? Or is it just like you said controlling the launches? As that must be what\'s munching the boxes all the time?

Will the bridges be smaller with the semi pp.

[JayDee]

Yes that is soft cut, there is a bit more to it, we have never used launch control on the old box and this woulda have stressed it even more, with the new one when it comes we will. The engine is staying as is

Soft cut, is that where the spark is cut one at a time to limit the revs rather than the whole lot? Will the box hold the 2.5 bar? Or is it just like you said controlling the launches? As that must be what\'s munching the boxes all the ti
Will the bridges be smaller with the semi pp.

[PGiljevic]

Yes that is soft cut, there is a bit more to it, we have never used launch control on the old box and this woulda have stressed it even more, with the new one when it comes we will. The engine is staying as is

I saw your video, looked like an old motec M4 based off the ECU mapping screen? if not what controls the engine?


Nice set up :WaveBye

[Grant Monkhouse]

I think they said they using the M2R on previous page Peter.