Went to a rolling road day...

[strange_days_uk]

to be fair Scott I don't really know.

I am still on the learning curve myself at the moment.

If your engine is ported, I would certainly expect more power than that.

If that temp figure is what the apexi was seeing, then it will definately have retarted the timing.

See if you can do some searching/research on the forum for informatin about inductiion temps and timing and the apexi, which is a very advanced piece of kit..

There is a whole myriad of useful info on here, just spend a little time to look for it

and that is still a decent figure, better than any stock FD..

[Cally]

i think i seen on the screen that fuelling was 11% over c02, is that normal for an FD? Yeah Ive read up on the apexi before but it just confuses me lol. Will the map have retarded the timing before anything could go wrong? Thanks for all your help / replies.

Anyone else got any views? advice on this?

[Ricco_04]

Originally Posted by strange_days_uk

explain please

To the best of my knowledge when a car is put on a rolling road this gives a power figure at the rear wheels (rather than a hub dyno or an engine dyno). They let the car run down to help calculate the transmission loss - it is this calculation that can vary with different companies. Some use a higher figure than others. That's why you will always see people's car getting a higher figure at rolling road x rather than rolling road y.

I think that's correct?

[Cally]

damn there was me thinking it was an answer to my high temp, come on people I am sitting here worrying!! lol

[stuart wizy]

if your intake temps dont go above 50 deg running full boost on lots of full chat runs, then your ic is working ok and is doing its job- ie under control.
pip told me that when he mapped my fd running twins with std mount trust ic running 11psi full decat 1300cc secondary injectors, this was on a very hot day in the high 80s, it pulled 285 rwhp on his dynapack hub dyno which are believed to be very acurate.
2 weeks later the car pulled a 12.8 sec quarter with road tyres on a cooler day.
you will loose power if intakes are high.

[Cally]

so it wont have like melted my engine or anything? I was bricking it for a while when I seen it... should I get my intercooler checked out?

[stuart wizy]

its funny how a lot of people claim big power in the south of the country, but compared to pips figures on the dynopack, other rr figures look much higher for the same setup.
last time i was down scr, there where 3 other fds there, who where claiming over 300rwhp with print outs, but when it came to the crunch they coudnt get below 14sec 1/4s with good launches and the same 60 fts as me and quick gear changes!!
There is big variations going on between rr roads, only the 1/4 mile times will prove this.

[Cally]

Well I am guessing mine would have been higher without the high intake temp so I dunno how accurate either of the rolling roads are.

I was just worried it could have done something nasty.

[ScuttleRX]

Dont worry it wont have done anything, if it had you would know something about it by now

Its just when the temps are high it can increase the chance of detonation, and this can be a one hit wonder with rotaries.

If you have a PFC and commander i like to monitor the air temps on there, only time you tend to get high temps is either a high boost situ like track day (how well the temps stay down will depend on your intercooler), or when your sitting in traffic (or on a dyno, or queue for a drag strip) and everything starts to get heat soaked.

[Cally]

I dont have a commander, need to get one but unsure where to get one and what one i need for my model of ecu.

Thanks for your answer youve probably allowed me to sleep tonight! lol

[ScuttleRX]

lol, what year is your car, there are 3 types of commander for FD, from memory there are for 92-96, 96-98, and 98+.

If you have a 96 car that can prove the awkard year (as I found out!) as you have to doubly make sure you have the right one!

If you do a search there should be a few threads on here showing serial numbers for correct numbers, somewhere like Nengun should have them listed for specific years aswell, or any of the vendors will sort you out.

[antnicuk]

Originally Posted by stuart wizy

its funny how a lot of people claim big power in the south of the country, but compared to pips figures on the dynopack, other rr figures look much higher for the same setup.
last time i was down scr, there where 3 other fds there, who where claiming over 300rwhp with print outs, but when it came to the crunch they coudnt get below 14sec 1/4s with good launches and the same 60 fts as me and quick gear changes!!
There is big variations going on between rr roads, only the 1/4 mile times will prove this.

I dont think the strip is a good place to compare rolling road figures (mine was tuned down south). The driving has a lot to do with it. Also, the torque figures which no one seems to think about. The peak final BHP is pub talk. But even when running up the strip you can still see over 1 second differences between each run.

[Cally]

Its an 92' model. Ive seen serial numbers etc when searching before but was unsure where would sell a commander on its own, been watching ebay but nothing has came up. I think I really should get one now though.

[dubber91]

rolling roads differ. dyno dynamics dynos are a low inertia dyno with eddy current braking. Other dynos (like dynojet) tend to be inertia dyno: basically using heavy flywheels to give a linear resistance to motion.
Dyno dynamics dynos have a constant load mode in order to do a power run: acceleration is set and the torque acting against the brakes is read, and recorded. Inertia dynos fix the revolution speed at each point: hence the many readings you have on the ava printout, each of these was a point at which the car was driven at steady speed.
The problem with this is that you dont get a true dynamic response, transient fueling is more difficult to get spot on and the momentum in certain components isnt accounted for. AVA readouts are smoother as each point is tested and the lines joined, whilst dyno dynamics readouts are true and show flat spots and areas of unsure mapping.
Doing a dyno run on a dyno dynamics dyno is more realistic as it is closer to what you experience when accelerating on the road, and not just joining the dots.
dyno dynamics dynos have integral and very well controlled correction sensors for inlet air etc, others, i have heard are easier to tamper with.

it might go some way to explaining some of the discrepancies

[peterwolds]

Originally Posted by Cally

I dont have a commander, need to get one but unsure where to get one and what one i need for my model of ecu.

Thanks for your answer youve probably allowed me to sleep tonight! lol

http://www.nengun.com/catalogue/product/143 seems a good buy

[Cally]

Yeah my mate linked me up with that last night, just gotta find out about import tax on it.

[Cally]

Another question, if I was to fit a FMIC would I need to get my apexi remapped or would it be ok to leave the map?

[Cally]

anyone know? As I am unsure if anyone maps rx7s up here...

[strange_days_uk]

It's always good to get the car mapped with any mods.

A front mount by it'self would not necessarily require a remap, as the apexi will read the lower intake temps and therefore inject more fuel, however if you want to get the most from your car you really should get it mapped.

Another place to get the Commander - RHD will happily lower value for invoice therefore less/no import duty

[nikp]

Also, the changeover point from single to twin turbo is 4500rpm only if full throttle is used. If partial throttle is used, then the changeover point differs. Could be one reason why that point is not evident.

[ScuttleRX]

Originally Posted by nikp

Also, the changeover point from single to twin turbo is 4500rpm only if full throttle is used. If partial throttle is used, then the changeover point differs. Could be one reason why that point is not evident.

Oh is it? you dont happen to know by how much, upper limit at which second turbo cuts in would be very handy, I may even give you some reputation points....