good weekend, friday saw a new arival of a uk spec twin turbo manual with 64,000 on the clock just needs some TLC to bring her back to her former glory! also saturday sprung a few suprises with the original zed on a rolling road at Motorscope,

got a great shock and where gobsmacked at the results

:D pics of the new zed coming soon!

Edited October 11, 201114 yr by Davegt40

top man dave, 500+ baby!!

hi, jack again, there is allot of threads about meets other than jae and what would be good is if we got a couple of us together and had a dyno then a blast on a track, obviously they would have to be near each other but would be good to see what people have got and then show it on the track. just my opinion:thumbup:

 

That's a great idea. AME at Silverstone on their dyno then off to the track. I'll be doing Tuesday 29th November (international circuit) and then Saturday 17th December (GP Circuit) and of course with a bit of luck will be a bit damp to make it even more interesting :)

I`ve questioned the gear, it reads 4th on the sheet but now I`ve listened and watched the video it does sound like it was in 3rd.

And yes I`ve quastioned whp to fwhp.... I can only summise that it was jumping around so much at higher rpm that it still achieved similar whp although fwhp was down???

Think Torque was still rising in run 2 compared to falling in run 1???

 

With stock injectors and the other mods youve done you,d be lucky to make 420hp,the engine would literally melt at 28psi and would never make that pressure anyway on hybrid tubs :whistling:.Either your being conservative on the engines mods or the dyno is in some serious need of calibrating.Im sorry but 505 fwhp on stock injectors and 28psi !! it just wont happen.Something is seriously a miss here! .Im running a much higher spec than that with custom mapping by John Dixon and making 475 fwhp,so how you can achieve that is just well let me say impossible.The gt525,s im running were max,d out at 18.5 psi and simply couldnt produce any more boost due to heat soak so how a t25/28 hybrid can do 28 psi is lets just say ludicrous.

With stock injectors and the other mods youve done you,d be lucky to make 420hp,the engine would literally melt at 28psi and would never make that pressure anyway on hybrid tubs :whistling:.Either your being conservative on the engines mods or the dyno is in some serious need of calibrating.Im sorry but 505 fwhp on stock injectors and 28psi !! it just wont happen.Something is seriously a miss here! .Im running a much higher spec than that with custom mapping by John Dixon and making 475 fwhp,so how you can achieve that is just well let me say impossible.The gt525,s im running were max,d out at 18.5 psi and simply couldnt produce any more boost due to heat soak so how a t25/28 hybrid can do 28 psi is lets just say ludicrous.

 

well he could but not for long before the pistons melted to the bores :alien:

i belive dyno runs are meant to be done in one gear from top as its meant to be 1:1 ratio. ie 6 speed box in 5th a 5 speed box in 4th etc. Did you notice him putting his foot on the brake on run down? i belive this ups the horse power readings???

 

I may be wrong but this is what i have been told in the past.

Nice figures Dave, I bet your lad cant wait to have a drive of it :)

Old thread I know, but is this beast still about or did the high-12 AFRs prove to be too much on the ragged edge?

Yea what he said?

Stock injectors !! mmmmmmmm(scratches chin) thats a generous dyno aint it.

 

stock injectors must be at 135% cycle duty Jimmer :)

Zed's to be dynoed in 4th gear as it's a 1:1 ratio... Any other gear will give "Other Results"

Max power is at 5815rpm on run#1, you won't actually run to the limits of the stock injectors at the peak power on a Zed at that point unless running well over 450bhp. You can do it safely by lowering the RPM limit if the turbos continue to produce boost efficiently and don't tail off. You would be losing 1000rpm, but it would keep the injectors from 'maxing' out. Obviously not the ideal set up, but a (relatively) safe way of producing high power on smaller injectors without killing your engine.

 

Fuel pressure at 4 bar gives 427cc, 4.5 bar gives 453cc equivalent flowrates. If you can hit 420bhp on stock 370s, then you would need a flow rate of 440cc/min for 500bhp. This requires a fuel pressure of 4.24 bar. It is doable, but in this case the engine figure has been manipulated (transmission losses of 35%). The reason for this as already stated is the operator using the brakes.

 

375@wheels is around 430bhp @ fly given 15% transmission losses. Doable, especially at such a lean mixture. Temporarily.....

the only thing you do noz that i wont is run higher pressures on the injectors i never go over 3 bar i guess its a personnel thing lol

the only thing you do noz that i wont is run higher pressures on the injectors i never go over 3 bar i guess its a personnel thing lol

 

I only run stock fuel pressure on the Zed & Pulsar mate. 3 bar on the MR2. I have run at up to 4 bar on my S13, which actually run at 2.5 bar as stock, but this was with larger injectors & uprated fuel pump. The only issue I see is ensuring the fuel pump can supply the requisite fuel at higher line pressures, within reason of course.

 

When I get close to maxing the stock Zed injectors on my car, I'll be running 4 bar pressure. To be honest, I don't think I'll need to at all with the stock Auto turbos.