when you getting it on the dyno to find out? would be interesting to see results

 

Martyn, would be very interested to see the result on the MD555/2.5 when you get it sorted. Presumably the compressor housing is slightly larger than mine

Here's my dyno result for MD555 on 2.35 (new age JDM STI).

 

Jay - was that with the normal 10% methanol?

 

To the best of my knowledge Jay, they have the same housing but the one I am trying has the larger 3076 comp wheel and a GT32 exhaust wheel. I will of course let you know how we get on.

 

be a couple of months until it is run in and mapped

the turbo sound very simular to wht MartynJ talks about ( probably the same one with a bit of RCM fettling \ marketing )

Rich

 

Duncan, yes that's right. The 2 overlays are straight V Power and then V Power + 10% methanol.

 

Jay,
What boost were you running on that dyno run? The curve looks like it maybe running out of puff at 5500rpm.

 

Shaun, yes it does run out of puff at 5.5k on the dyno but isn't noticeable on the road tbh. This was 1.9 bar peak. I think maybe this is due to the small hotside on the turbo though, but be interesting to see some more results i.e. Martyn's etc. I doubt my heads are limiting factor as I have new age JDM STI AVCS. Torque is very nice though but a bit behind you boys Mind you, this car does 20k a year as a daily driver

 

Jay,
Does the boost drop off after 5000 or is it steady? The peak power is quite a bit before what one may expect.... maybe down to the fact that it is running too much boost at the top end and bringing the peak power figure to the left?

 

Did you do a comparable run on normal fuel Jay?

 

Shaun, that had occurred to me about boost. However, there's some history here...

The car had been mapped at 2.1 bar initially and that made less power than shown above (455 IIRC). I then changed mappers over to Simon who reduced boost and was dyno mapping so could see effects of boost changes whilst mapping. He's tweaked the car a few times now and is happy that 1.9 bar is optimum for the setup. Reducing boost below that doesn't generate more power.

You may be right that running say 1.6 bar would produce peak power further up the revs, but this would be lower power and less torque overall. As it is, the mid-range is very punchy and usable.

Duncan, there are two sets of curves on the graph above... the lower one is straight V Power, then we did a 10% meth map on the same day. So yes, they are directly comparable. Both are at 1.9 bar and are very similar curves.

Sorry OP if we're hijacking

 

Jay,
Sounds like you have the best set-up for what you have then.

Thanks for the info.

 

Mark, LATERAL PERFORMANCE,
I have kind of come around to the same idea as you about rods and turbo, what would be a more realistic bhp and torque figure for me considering i havent done the rods?
I see BLOUCH doing some DOMINATOR turbos, think there is a 470 and a 490 bhp one.
I want as quick a 1\4 mile car as i can get basically, that still has the back road punch and response of the standard classic

 

bump for all these md555 graphs

 

just a quick question do you have to run diffrent down pipes/up pipes for all these 500+ turbos??

 

std uppipe and down pipe

as far as i have seen on snet there is only one car running 500 + on these md based turbos, dosn't say much as I haven't seen any under 500 either

wont find out anything with mine till after june 13th

 

me2 i just wanted to check as ive spoken to a mate of mine and he told me the the s206 wil require a diffrent up pipe and down pipe il double check with martyn and alan.

 

FWIW I have one of the old RCM GT35P20 ported shroud hybrids on my 2.0 P1 - runs circa 440bhp/380 ft lb at 1.9bar.

FB

 

Hi better check as I was referring to the md555 based turbo

 

The S206 Mus will fit on the stock uppipe, it does require a custom downpipe or modification to the exisiting one and does require intake mods similar to any other turbo fitted with a 3 inch cover.
Figures for the 2.5 on the S206 are on their way, but we were reluctant to push it too much as the customer is off to the Nurburgring tomorrow.

So far we are seeing 430bhp and 500lbft @ 1.5 bar boost on Sainsburys 97ron fuel.
The owner will be delivering it back to us when he gets back and then we will be trying it with more boost, and then a 10% methanol mix to see what it makes.

Martyn

 

So not a bolt on turbo then ?

 

Very true Duncan, although the modification to fit isn't beyond any half decent exhaust manufacturer. We can supply the downpipe ready made as an optional extra should customers prefer.
The 2.5 Classic we have been testing was quite something on road test, especially considering the stock UK Turbo heads and cams. A brief test proved that 2 bar plus can be made before 3500rpm without any surge.

 

thanks for clearing that up martyn, so on sti 4 heads 1.8 bar, v-power you would expect it to spool earlier and also give more power and atleast 500lbft that will make one naughty classic

p.s banny start saving two reason you obviously know why

 

If anything, STi4 cams will spool later, not earlier.


Martyn, please can you post the torque v boost graph showing 500ftlbs @ 1.5bar.

 

Will hopefully get my hands on my dyno graph from my set-up, when it was mapped and run last week on Tracktives HUB dyno. The turbo (AET standard position/bolt on) enabled the engine to make 486bhp/515ftlb at the HUBS on VPower.

Will post when I get my hands on it.

 

[QUOTE=Lateral Performance;8718763]If anything, STi4 cams will spool later, not earlier.


arent sti heads better than uk heads? magic seven had an 18G on his uk terzo and he got full boost on the road by 4300rpm while ki8lla on his sti 3 type r got full boost by 3500 on the road maybe before. both had exactley the same mods. from my understanding i thought sti heads spooled earleir and revved better cause they flow more

 

heres a graph of scoobyclinic's SC50 (bolt on turbo) on a ej257 with rods and pistons with standard sti 5 heads, running v-power and 10% meth

clinic chucked the engine together 3 days before scooby shootout in 2007 and it ran 11.0 @ 127mph, would of gone 10's if the PAR box had'nt broken

 

[QUOTE=mus 1st class sti type r;8718996]It wasn't really a accurate comparison, I had heavily ported headers as well as a completely different engine management setup

 

[QUOTE=K18LLR;8719923]ok what about my car i had a 20G on there with exactly the same mods and that was b4 i used meth i was seen full boost at 3800 in 3rd gear while magics uk terzo was seen it at 4300 maybe later and he had an 18G which is smaller turbo than my 20G?? oh yes and he was also using meth and water mix.

 

11.00 seconds thats good is that with full weight and is it an ra?