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Thread in 'Technical Questions' started by dale_b, Nov 23, 2012.
It was easy and cheap to make. First time making one and it hasnt failed.
2 litre 4 cylinder forged beams engine
have a twinscroll t3 manifold
h1c 11cm twinscroll or hy35 10cm single scroll?
Decided to go with h1c first....
Great thread! Took a while and fell asleep couple of times but great read!
Currently: forged RB25DET with original manifold and internally gated Holset HX32 from Compressor Racing. Turbo spools fast and delivers me 423bhp/506Nm @ 1.4 bar, but lots of backpressure and egt's are high. A lot to gain through better timing but no E85 readily available here.
This is my last power build in my life and I wanted to crack the 500/550bhp mark this time but I bought the wrong turbo I guess, was looking for great spool but made a rookie mistake of getting too small a turbine and sacrificed a lot of top-end..
Now I'm looking @ getting me an HE351 with a decent twinscroll manifold, big downpipe and progate instead. What ballpark bhp figures will this give me you guys reckon?
(supporting specs are EV1000's, 455lph pump, R8 coils, NZ wiring trigger kit, big IC, freddy with Q45 tb, no headwork and oem cams, Link G4+, fpr, 3" exhaust, 3" ic piping)
I have rb30/25det with a he351 holset (14cm) running 553 HP at ~1,5 bar. Stock head too. You should be able to get similar or a bit higher HP figures with the 25, propably just a bit higher in the rev range (I've limited mine to 6800rpm).
I posted a bigger spec list and dyno graphs here ~2 years ago. Page 85 here
Hey! Thanks for replying! Yes I saw your post, very interesting! I compared your graph and spool isn't very different except you have 500 more cc's offcourse. The turbo I'm looking at has a 16cm turbine though, this might be a bit too laggy for me...I don't know..I'll see when I get to it I guess next year somewhere, but I'm contemplating my options. I LOVE my Holset and would love to stay with the brand :-) Right now budget is leaning towards the respray which turned into a semi-restauration..
my h1c is spraying out oil, should i buy a new turbo or can it be repaired cheaply?
Is it a genuine Holset or one of the dodgy Chinese ones off eBay?
spraying from where exactly and when ?
genuine, off a daf truck, came with 21cm2 housing, i have put on an 11cm2 one from compressor racing
when idling and when revving
sounds fucked then.
Presumably you've checked the obvious, impeller wheel/shaft for excess movement etc ?
Ensure oil return is good ?
Yeah all that is good. I've been told it could be seal? I'm going to see if I can get it repaired for cheap
Should be fine to have it rebuilt at someone like Midland Turbo
oil return is god, do i need to fit a restrictor, been told it could stop leak
what size do i need?