Harey

Hi All, I am converting my car from pod to stock airbox. The previous owner gave me the airbox but he did not give me any screws or anything to fasten it down. Anyone have some lying around? I am trying to get nissan to get me some but they are struggling. Any help much appreciated! Happy to pay for em.

Hi All, I am converting my car from pod to stock airbox. The previous owner gave me the airbox but he did not give me any screws or anything to fasten it down. Anyone have some lying around? I am trying to get nissan to get me some but they are struggling. Any help much appreciated! Happy to pay for em.

Hi All, I am converting my car from pod to stock airbox. The previous owner gave me the airbox but he did not give me any screws or anything to fasten it down. Anyone have some lying around? I am trying to get nissan to get me some but they are struggling. Any help much appreciated! Happy to pay for em.

Hi All, I am converting my car from pod to stock airbox. The previous owner gave me the airbox but he did not give me any screws or anything to fasten it down. Anyone have some lying around? I am trying to get nissan to get me some but they are struggling. Any help much appreciated! Happy to pay for em.

Ok now with Hypergear ATR3G4 and updated HKS GTRS. For both of these dynos they hit the rev limiter just after 170kph which earlier than what the other cars here are doing. I have modified the speed per rpm for these two and set 7000rpm = 170kph. They both seem to be have very low power down low which doesnt seem right. Dynosheets with rpm are much preferred. rpm per speed seems to vary quite a bit between cars ??

Thanks for the link! Very interesting.

I hope thats an april fools joke HAHAHAHA Change between 3071 and 3076 turbos between the street and track HAHAHA Apologies if you are serious, but there really isnt enough of a difference to worry about doing that.

+1 for dropping exhaust and testing.

Post one up then. I just chose the first one I could find in the dyno thread that had a stock engine and looked like it was running well.

Well post up the revised PU high flow on a stock engine and show us. I am hesitant to post up kwickr33s dyno as he has worked heads, therefore not being equal to the other dynos.

Would an exhaust restriction cause it to hit positive boost pretty quickly, but then boost slowly and still make a good peak power figure?

Ok HKS GTRS added Interesting granthem your dyno finishes around 175kph or 6200rpm. What happens after that? Just flat?

Nice work! Sounds like your happy with it. If you ever do want more power you know that just changing your exhaust and a retune will net some big results. Not just peak power either as you discovered, as well as increased peak power you will also get less lag!

Post up (or link) your dyno and I will add it in to the chart.

If the car is seeing positive boost pressure at 2800rpm and the turbo will not boost any higher I think you have other issues. Its a pity the performance place couldnt help identify anything. The turbo could be fine, sure a GT3076R would be better but doesnt mean the turbo on there cant work well. Would suck to buy a new turbo and then find out the issue is still there. Although I cant say what tests to run, hopefully some other people on here can help with that. Hmmm so its got to be something that restricts the turbo as it spools up but still allows it to get to a nice peak power. hmm Yup -1 for the GT35R with 0.63 housing, dont do it.

+11ty Post of the year!!!!!!! Well thought out and statistics to back it up.

Sooo true. This is only one example from each turbo. I am not sure if the dyno I chose for the HKS 3037 is really doing it justice. Found it on page 25 of the rb25 dyno thread so if you have a better one let me know. I try and find stock engines and roughly 17psi tapering off to around 15.

Personally I the HKS 2835 is the choice off all those turbos. I would be very content if I were you.

Ok heres one from 2000rpm also with exhaust housings mentioned. The HKS 3037 dynosheet starts at 100km/h so no info below then, so I just left it out.

Hells yes I am interested Fair effort for you though.

I think you have chosen well with the 3071R. I think a 2871R is too small for an rb25. I would actually choose the 0.82 housing with the 3071R but thats just me. I think the 3071R has the nicest curve (excluding the hks turbos) on that chart.

Yup will try and get some 2000rpm readings. I got the 3071R chart from here: http://forum.nistune.com/viewtopic.php?f=2...fa&start=15 Its really hard to compare apples with apples as I mentioned with different boost levels and other differing setups. I reckon the really surprising result is the PU High Flow offered from Hypergear! All turbos (except standard and std hi flow) have a 0.82 equivalent size exhaust housing. Im a mid range top end person so thats what I naturally focussed on. In my opinion you want to make sure a turbo makes power all the way to redline, no point having a such a nice revvy engine like the rb and then a restrictive turbo. Yes there are plenty of turbos that can still have some nice low down as well which is the ideal of course. If low down torque is your number 1 preference then why buy an rb25, plenty of other larger capacity engines with more low down torque. I agree though its about the overall package. Yeah would be great to get a more detailed one going. I have always found it hard to look at different dynos and compare them.

Anyone got the speed per rpm calculator? Is it different between 33 and 34s?

As requested: Now with HKS 2835 and 3037 Pro S

they are out of my budget so guess I hadnt even been thinking about them. will see if i get some more "spare" time at work hehe