EvilChap's S15 Project

[Daz]

Right, sweepstake time.

I'm guessing 628bhp @ the fly . (I can't remember the full spec though so wild guess )

[Vigilant teSte]

I'll take 595hp at the fly



Disclaimer: I have no idea what the spec will possibly produce - 595 sounds like a conservative estimate

[sprout]

650 lol

[Evilchap]

I reckon my fuelling will make maybe 500rwhp - which sounds like plenty.

After doing some miles I'll go back with a fuel system in there and get everything tweeked

[TriniGT]

Good stuff can't wait to hear the figures.

[Chriscooke]

I'll go with 499 bhp just as it'll wind you up

[Evilchap]

Haha, if it survives the dyno, I am happy... time will tell if it does or not!

[TM_S13]

let us know when you know

[Teggers]

I can hear the rods exiting the block at 7000rpm now I hate waiting knowing it's in action like this!

I'd be asking them to be on the phone in the dyno area while it was being run Especially after all this time!!!

I'll go with 540 at the fly

whatever it makes, it'll be great for you to finally get it back and running! Makes me just reading about it and thinking of everything you've been through.

[SidewaysThough]

OMG! I cant believe its running, at a proper garage, on a dyno, and with an MOT. Jesus Ben, next thing you may even drive your car, this could be the year hey!!

Im aiming for 571 @ Flywheel, I reckon that will be sweet with your fuelling, and getting in early, 720 @ Fly when new fuelling and fully mapped!! Im so envious I cant see this run!

[Chriscooke]

So what did it make then?

[Evilchap]

400@hubs at 5500 - having timing and boost creep issues.

[M.D.]

there is a way to avoid boost creep i found............. turn the boost up higher than it can creep too ha,

so your looking at 460bhp already then, whats happening with the timing, CAS gone or something??

[big_mac]

400@hubs at 5500 - having timing and boost creep issues.

good figures. what boost is it running at that revs? any graphs?

[Evilchap]

I'll have some graphs possibly tomorrow.

There's two problems at present...

First issue is the boost creep. It goes to 1bar at 3500, but when it reaches 5500 roughly it spikes to 1.6.

This issue we're thinking (mostly Mark @ Abbey is thinking) it's the external wastegate only being 38mm - it needs to be bigger.

The second issue is it's very eager to det. So we cant just map for 1.6 as it starts to det This may be down to high compression, but we dont think it is as it's not a high-comp build. I cant remember the exact figure, but I should know tomorrow morning if the piston suppliers work saturdays If it's not the compression then it's a little bit more of a challenge.

Has anybody else got any suggestions?

Please forgive my lack of knowledge, it comes from being out of my depth. Feel free to ask for more info and I will try to supply the info.

[VIDAL BABBOON]

38mm external gate does sound small for a turbo like yours
Also to check would be the size of the take off that feeds the external gate, if that is smaller than the wastegate. It wont make a massive difference upping the size of the gate as flow will be restricted by the runner feeding it.

With regards to the second issue of it being eager to Det, who built the engine ? they must have calculated the comp ratio in order to specify gasket and head work Piston will play a part in the compression but stroke will play a bigger part, are the rods stock length?

[Evilchap]

It was built by RK Tuning - I am trying to get the figures for the pistons and rods from MGT who supplied them

[Damo]

is it plumbed back in to the exhaust system?

that waste gate on my car ran at 1 bar all day long when plumb into the exhaust system but when i split it so it had its own path it ran at 1.4 bar

hope this helps
damo

[Evilchap]

Thanks damo :-) it's plumbed back in :-)

Anybody know how much effect the turbo change has on wastegate size? This new one if anything is physically smaller than the old one, which uses the same wg and manifold.

[big_mac]

that may be your problem then, having a small turbo on a big engine isnt always the best idea unless you run a big exhaust housing. The small exhaust housing encourages boost creep, can you get a larger exhaust housing for the turbo if needed?

a larger wastegate may be a workaround but it may not cure the cause. With my turbo we are already wondering if it will be too restrictive, originally the turbo was speced to run on a 2.5 nd as such might be too wee for the big ol '30.

was your turbo specced for the engine and its flow etc?