B-Man

I'm not trying to justify anything - The wasegate was bought pre-loved and we didn't know what sort of spring was in it. With the 3040 minumum boost (ie e-boost turned off) was 18 PSI same as the the 2835 (18 PSI) but as you can see from the graphs, boost goes down to 16 PSI as revs increase. I'd prefer for it to stay at 18 or 20 PSI that's what I am sayaing. All I am stating is the facts - and looking for answers.

OK - I didn't get a copy of the test run with WG closed - but this is what the Power curve looked like (you can see what I mean bu the experly applied MS paint job I did on the graph) With the Wastegate and EBC working 100% on the 20 PSI run, I would have expected a curve like this Am I dreaming ???

We are of the understanding that that the wastegate spring is 18 PSI - cause thats the minimum boost we could get out out of it when the 3040 was on. Now if the WG spring is rated at 18 PSI - why is it dropping to 16 PSI ? Spring might be worn. The converse of this is - If it is a 16 PSI spring - why were we getting a minimum of 18 PSI on the 3040 (and the 2835) from 4000 RPM to 5500 RPM then the drop off ? I reckon this is wastegate related...... Its now a $$ versus HP gain decision on whether to go chasing it down.

Yep - SK you got it spot on ! That's what I reckon too !

Umm - I just went through those threads and only one of them was useful to me. But none of them has pix. So when I mount mine, I'll take pix for the crowd

Ha ha - thanks Duncan ! You are a sport ! Problem is that I can't spell exqutingwisher - so no good on the search - I guess I could copy & paste - but hey: Yeah - I am lazy. I was thinking out mounting my Super Cheap extinguisher to the A pillar - I guess not hey ??

Grepin - dude, can you post your graph ? I wouldn't mind seeing the difference between internally gated and externally gated 2835s

And if 16 PSI is max efficiency for this setup - how come when we set boost to 20 PSI it drops back to it's efficency ?? That's the bit I don't get - Should't it hold at 20 PSI ? (albeit out of efficiency range) Or is my boost controller clever enough to know where the efficiency peak of the turbo is ?? (OK that's silly, but you get what I mean)

I guess at the end of the day - if the spec is 41 lbs flow - that is the spec. But you know that I like to push the boundaries. Just to see if the spec is the spec or maybe just a conservative number on a bit of paper so expectations are achieved. ha ha ha ha I'm thinking I really need a 3.0L with a RB26 head to play with now :D

Jeez - I thought these HKS Turbos just started to party at 18 PSI. I'll be careful with the Turbo. No more boost OK. Oh and BTW, 28 PSI was just what we saw during the test with the WG closed. It don't neccessarily equate to the 300 we saw. If you get what I mean. re Expectations: What about teh naws ? You know I want the best of both worlds don't you!

Where is that Duncan ?

ess oh eff tee

When we kept the gate closed deliberately, power went to 300 @ 28 PSI then they backed off the throttle (didn't want to blow anything up - he he) This is beyond my small brain - need the professionals helpp with this one - ha

256 / 9 Tomei poncams..... And Exh Cam gear set at 4 ( I think) Head has been ported slightly. How do you test for this ?? Sounds complex and costly.

I think it dropped like 1-2 PSI with the 3040 - not as significant as 4 PSI. The Wastegat spring is an 18 PSI spring, I think - It the spring is adjustable too - I think - maybe if I make it stiffer/stonger, the WG will open slower ?? Also, might have to read up a bit more on the E-Boost, cause I recall that you can set something on them that allows for slow or fast solenoid action - or something like that . If I can get that 4 PSI back, then I'll hit 300 for sure with the 2835. If I can get that - then I thinkI may have found the most perfect allround turbo for the RB25 :D Power and response all in one package :)

Hi Cameron - No just the E-boost. But yeah - since going to the smaller turbo - and keeping the big wastegate - I'm thinking along the same lines as you - too much air going out the WG. Hence the poor old turbo is trying to pump more boost , but can't cause 4 PSI of it is going out the gate. Bloody Wastegates - who needs then ......

Hi Guys, I just got the HKS 2835 tuned - Not a bad result I guess. Power comes on much sooner compared to the HKS 3040. But you will notice that boost drops from 20 PSI to 16 PSI from 4000 RPM to 7500 RPM. As a test, the guys jimmyd the wastegate closed via the E-Boost (somehow) so so that the gate stayed closed all the time and power kept going up to ~ 300rwkw @ ~ 28 PSI. So we know that turbo and engine is capable - Just - it seems that either the EBC or the Wastegate are not working to their best. EBC is Turbosmart E-Boost Wastegate is Trust Type R 45mm (SydneyKid - is this too big maybe) Anyway here are the graphs Cheers .

Frankie - your friend needs to check out their boost controller

Hi Guys, Here's mine. It was a hot day - Tune wasn't that good (ok but more there) - Turbo wasn't in the best shape - Restrictions in the exhaust - etc Overall result was OK - but you know how it goes...

Waiting, Waiting, Waiting ,

Sorry - I should have picked that up from the SAFCII bit

I don't think sarcasm will work when trying to educate the youth on the merits of "taking it to the track" How about another approach ??

Maybe someone should do a sticky in the NSW section and NSW Members section - on how the club is different to the forums. Lots of people get mucked around with this and sometimes people get ticked off when they are referred back to post or comments that are ambiguous or unclear. Have a nice day

Stock ECU ???

It's the SKYLINE'S AUSTRALIA sticker on the back of it JP - Plus all the GTR parts. How much does the car weigh now ??