Dyno figure
#44
I would of expected a solid 425+ with that size turbo at 2 bar, from my very small understanding of turbo compressor maps exactly half way into the plot would be 42.5 lb/min or 425 hp.
gt3071 at 1.6 bar on 1900cc is making 420 hp on each bank of my gtr, so your compressor definitely has more to give if you want it, what size exhaust housing are you on ? do you have a dyno plot we can see ?
gt3071 at 1.6 bar on 1900cc is making 420 hp on each bank of my gtr, so your compressor definitely has more to give if you want it, what size exhaust housing are you on ? do you have a dyno plot we can see ?
#46
#49
#53
#54
#56
Why do the runs end at at about 5700rpm? If was hitting the limiter the graph is bollocks as the rpm scale will be miles out.
The rev limiter on that sort of spec must be up over 7500rpm surely? Looks like the best part of the graph is missing if the rpm scale is right
The rev limiter on that sort of spec must be up over 7500rpm surely? Looks like the best part of the graph is missing if the rpm scale is right
Last edited by James @ M Developments.; 12-07-2014 at 09:54 PM.
#58
that's just what I was thinking ? am I right in thinking the dyno will read the correct torque regardless of rpm, but then when the torque is divided by 5252 and the multiplied by the rpm to get hp figure the lower the rpm reading is the lower it will show the hp to be ?
by my calculations assumeing it was actually being revved to 6800 rpm the true hp reading at the limiter would be 466 hp
Last edited by scoooby slayer; 12-07-2014 at 09:57 PM.
#59
that's just what I was thinking ? am I right in thinking the dyno will read the correct torque regardless of rpm, but then when the torque is divided by 5252 and the multiplied by the rpm to get hp figure the lower the rpm reading is the lower it will show the hp to be ?
by my calculations assumeing it was actually being revved to 6800 rpm the true hp reading at the limiter would be 466 hp
by my calculations assumeing it was actually being revved to 6800 rpm the true hp reading at the limiter would be 466 hp
That would be more like the expected power really,
Makes peak boost very early for a big old turbo too, I think the dyno graph is scaled all wrong personally,
I hope he didn't pay much for the runs as it only appears to show 3000 rpm of his engine range must of been half price
Last edited by James @ M Developments.; 12-07-2014 at 10:17 PM.
#64
Lol It was run up to the top end of the rpm James I never bothered looking to much at the graph scaling just the figure ! This is a shame as Charlie normally has a good rep
#66
I wonder what he used for rpm? Was it roller speed? Or did he use a pick up off the coil/injector?
I can only imagine it was roller speed and just not set up properly,
This can happen by using the old crappy ford tacho to check rpm, or setting it while the car isn't loaded up,
I always try to use the data stream and pick the rpm up from the ecu, if I'm nit using ign/inj pick up,
check it at around 3.5-4k so the car is loaded up on the roller, then once a run has been completed, trim the rpm scale finely to match the rev limiter, before adding a stop speed to cut the run just before the limiter.
I can only imagine it was roller speed and just not set up properly,
This can happen by using the old crappy ford tacho to check rpm, or setting it while the car isn't loaded up,
I always try to use the data stream and pick the rpm up from the ecu, if I'm nit using ign/inj pick up,
check it at around 3.5-4k so the car is loaded up on the roller, then once a run has been completed, trim the rpm scale finely to match the rev limiter, before adding a stop speed to cut the run just before the limiter.
Last edited by James @ M Developments.; 12-07-2014 at 10:32 PM.
#67
#68
I wonder what he used for rpm? Was it roller speed? Or did he use a pick up off the coil/injector?
I can only imagine it was roller speed and just not set up properly,
This can happen by using the old crappy ford tacho to check rpm, I always use the data stream and pick the rpm up from the ecu, check it at around 3.5-4k so the car is loaded up on the roller, then once a run has been completed, trim the rpm scale finely to match the rev limiter, before adding a stop speed to cut the run just before the limiter.
I can only imagine it was roller speed and just not set up properly,
This can happen by using the old crappy ford tacho to check rpm, I always use the data stream and pick the rpm up from the ecu, check it at around 3.5-4k so the car is loaded up on the roller, then once a run has been completed, trim the rpm scale finely to match the rev limiter, before adding a stop speed to cut the run just before the limiter.
#69
#70
Oh well, I guess there will be a more accurate part two of this thread next weekend then
Guessing when the rpm scale is corrected it looks a tad lean at what will end up being around 4500rpm too
Guessing when the rpm scale is corrected it looks a tad lean at what will end up being around 4500rpm too
Last edited by James @ M Developments.; 12-07-2014 at 10:43 PM.
#71
Well its all guess work from what matt was saying as the tacho isnt set right as said sheady had removed the limit and was revving it past 7k on the mapping session which is nothing out the ordinary revving it to that and hoping matt missheard the limiter bit
#72
I'd be revving one of them up close to 7800 if it were mine, certainly over 7500.
The only time it would ever see a 5500rpm rev limit is in limp home
The only time it would ever see a 5500rpm rev limit is in limp home
Last edited by James @ M Developments.; 12-07-2014 at 10:39 PM.
#73
#74
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So it was Ł40 well spent then lol!!
Limiter is at 7200 and was lifted while mapping iirc(its all a bit blurry due to me being a pussy), the only time it will ever see that is either mapping or or if it gets nicked lol I've got far too much mechanical sympathy lol!!
Either way is a quick-ish car and I'm not running components to its limit! so it should last for ever lol
Limiter is at 7200 and was lifted while mapping iirc(its all a bit blurry due to me being a pussy), the only time it will ever see that is either mapping or or if it gets nicked lol I've got far too much mechanical sympathy lol!!
Either way is a quick-ish car and I'm not running components to its limit! so it should last for ever lol
Last edited by Matt Baxter; 13-07-2014 at 07:04 AM.
#75
So it was Ł40 well spent then lol!!
Limiter is at 7200 and was lifted while mapping iirc(its all a bit blurry due to me being a pussy), the only time it will ever see that is either mapping or or if it gets nicked lol I've got far too much mechanical sympathy lol!!
Either way is a quick-ish car and I'm not running components to its limit! so it should last for ever lol
Limiter is at 7200 and was lifted while mapping iirc(its all a bit blurry due to me being a pussy), the only time it will ever see that is either mapping or or if it gets nicked lol I've got far too much mechanical sympathy lol!!
Either way is a quick-ish car and I'm not running components to its limit! so it should last for ever lol
I may be wrong but my understanding is your 360 lbft figure at 5800 rpm should still be correct so if we assume that was actually 7200 rpm, so 360 lbft / 5252 then x rpm 7200 = 493 hp
I said 482 do I get the boost bar lmao
#76
#78
its about 400/400 then roughly aint it mark if I can calc it back the other way and apply 1400 rpm correction upscale.
Last edited by scoooby slayer; 13-07-2014 at 08:26 AM.
#79
Matt get it up to MSD James can then thrash the tits off it and you can get a true figure.
I might be a idea to go to the beach and not to watch tho at least you can run yours on the dyno my clutch slips on mine in 4th and 5th
I might be a idea to go to the beach and not to watch tho at least you can run yours on the dyno my clutch slips on mine in 4th and 5th