Post your dyno curve here
Discussion
Monsterlime said:
QBee said:
Two separate issues here IMHO.
But what do I know?
1. If your lambda sensors are still in, you don't need a tune resistor.
2. The stalling on re-starting is something to do with the mix of fuel left in the system from the previous run, the ECU and the stepper. Blitz racing will know the precise answer. I doubt it is the stepper - i think you would see the stalling more frequently.
Thanks. Sounds like new thread time. But what do I know?
1. If your lambda sensors are still in, you don't need a tune resistor.
2. The stalling on re-starting is something to do with the mix of fuel left in the system from the previous run, the ECU and the stepper. Blitz racing will know the precise answer. I doubt it is the stepper - i think you would see the stalling more frequently.
1. Pretty sure they are, but will obviously check to confirm.
2. I did actually have general idling issues, and in the course of fixing that, the stepper was replaced. In the end though, that was fixed with a new ignition amplifier. Sounds like I need to plug in the laptop with Rover Gauge to start the diagnosis.
Had a dyno run at the Neil Garner open day today and disappointed with the result.
Car is a 450, stealth cam fitted last year, fully decatted, ACT carbon trumpets and a smooth bore elbow. So minor mods only. Was still hoping for more than 240hp though.
Looking at the AFR the car is running very lean as the revs rise and I hope this is why the power curve tapers off so rapidly.
It has a 'copy' AFM so this might be to blame. Either way, had a good chat with Joolz today and I think I'll get it remapped later this year.
Car is a 450, stealth cam fitted last year, fully decatted, ACT carbon trumpets and a smooth bore elbow. So minor mods only. Was still hoping for more than 240hp though.
Looking at the AFR the car is running very lean as the revs rise and I hope this is why the power curve tapers off so rapidly.
It has a 'copy' AFM so this might be to blame. Either way, had a good chat with Joolz today and I think I'll get it remapped later this year.
A900ss said:
Had a dyno run at the Neil Garner open day today and disappointed with the result.
Car is a 450, stealth can last year, fully decatted, ACT carbon trumpets and a smooth bore elbow. So minor mods only. Was still hoping for more than 240hp though.
Looking at the AFR the car is rubbing very lean as the revs rise and I hope this is why the power curve tapers off so rapidly.
It has a 'copy' AFM so this might be to blame. Either way, had a good chat with Joolz today and I think illbfey it remapped later this year.
Is this the same RR that gave low figures at the growl?Car is a 450, stealth can last year, fully decatted, ACT carbon trumpets and a smooth bore elbow. So minor mods only. Was still hoping for more than 240hp though.
Looking at the AFR the car is rubbing very lean as the revs rise and I hope this is why the power curve tapers off so rapidly.
It has a 'copy' AFM so this might be to blame. Either way, had a good chat with Joolz today and I think illbfey it remapped later this year.
Not sure but it was North London Dyno. Might be a bit low as a friend who has a 330hp car on a dyno last year made 300 today.
However a 400 after me made 220 and it was straight as a die on its gradient as it went up in power .
Either way, the car is leaning off and I need to get that sorted.
However a 400 after me made 220 and it was straight as a die on its gradient as it went up in power .
Either way, the car is leaning off and I need to get that sorted.
A900ss said:
Had a dyno run at the Neil Garner open day today and disappointed with the result.
Car is a 450, stealth cam fitted last year, fully decatted, ACT carbon trumpets and a smooth bore elbow. So minor mods only. Was still hoping for more than 240hp though.
Looking at the AFR the car is running very lean as the revs rise and I hope this is why the power curve tapers off so rapidly.
It has a 'copy' AFM so this might be to blame. Either way, had a good chat with Joolz today and I think I'll get it remapped later this year.
Doesn't look like it's hitting full load enrichment? Could just has easily be the throttle pot under reading at WOT, if I recall it requires the throttle pot to give something like 4.5 v before it gives full power fuelling. I'm sure Joolz will take you through it.Car is a 450, stealth cam fitted last year, fully decatted, ACT carbon trumpets and a smooth bore elbow. So minor mods only. Was still hoping for more than 240hp though.
Looking at the AFR the car is running very lean as the revs rise and I hope this is why the power curve tapers off so rapidly.
It has a 'copy' AFM so this might be to blame. Either way, had a good chat with Joolz today and I think I'll get it remapped later this year.
phazed said:
A900ss said:
Had a dyno run at the Neil Garner open day today and disappointed with the result.
Car is a 450, stealth can last year, fully decatted, ACT carbon trumpets and a smooth bore elbow. So minor mods only. Was still hoping for more than 240hp though.
Looking at the AFR the car is rubbing very lean as the revs rise and I hope this is why the power curve tapers off so rapidly.
It has a 'copy' AFM so this might be to blame. Either way, had a good chat with Joolz today and I think illbfey it remapped later this year.
Is this the same RR that gave low figures at the growl?Car is a 450, stealth can last year, fully decatted, ACT carbon trumpets and a smooth bore elbow. So minor mods only. Was still hoping for more than 240hp though.
Looking at the AFR the car is rubbing very lean as the revs rise and I hope this is why the power curve tapers off so rapidly.
It has a 'copy' AFM so this might be to blame. Either way, had a good chat with Joolz today and I think illbfey it remapped later this year.
Mine produced 302 bhp and 348ftlb this time, they took the rpm from a lead as the tacho was under reading which produced similar to two years ago on the bhp, can't remember previous torque. The difference for me is that since then it's had a bigger AFM, injectors, carbon trumpets and some rolling road time with Mark Adams at mech repairs in cheltenham last Nov. mark got it up to 335 and 351 so although the the torque was similar the bhp was down by 10%. I'm happy with the numbers from either RR, they will always be different and I wasnt hanging out of the boot at Neil garners for the final run! It's very difficult to get a good comparison, different atmospherics, differnt RR and the car has done 3 k more miles. Only real difference though is I now have a BTR biff instead of the GKN which chewed itself to pieces, doubt that will make any difference but it still doesn't make the original factory figures 
Mine produced 302 bhp and 348ftlb this time, they took the rpm from a lead as the tacho was under reading which produced similar to two years ago on the bhp, can't remember previous torque. The difference for me is that since then it's had a bigger AFM, injectors, carbon trumpets and some rolling road time with Mark Adams at mech repairs in cheltenham last Nov. mark got it up to 335 and 351 so although the the torque was similar the bhp was down by 10%. I'm happy with the numbers from either RR, they will always be different and I wasnt hanging out of the boot at Neil garners for the final run! It's very difficult to get a good comparison, different atmospherics, differnt RR and the car has done 3 k more miles. Only real difference though is I now have a BTR biff instead of the GKN which chewed itself to pieces, doubt that will make any difference but it still doesn't make the original factory figures
It's a '93 430, so 225bhp is a bit low...
After some checking I found 1 of the HT leads to be melted through, so it was 1 cylinder down at the time.
It's up at about 56k miles & I don't see a Cam change in the paperwork anywhere.
So those figures would be about what I would expect (not had it dyno'd after changing the HT leads).
Mark
QBee said:
CHIMV8 said:
283.. at fly with jools
400 with stage 3 heads
Please tell us more, like what is the basic spec of your engine?400 with stage 3 heads
New Clutch
Stealth cam
Stage 3 heads
Ported inlet manifolds and 45mm trumpets
72mm plenum
Lightened flywheel
Cam and cranke bearings,shells replaced etc
Removed pre cats
Clive Y and ACT smooth bore induction system
Running standard rear box silencer
Standard loom and Dizzy
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