tayr Posted July 29 Share Posted July 29 (edited) Hey everyone - hope all is well. Recently picked up an NA-T Non VVTi setup. (I am a complete single turbo / NA-T Virgin so gather info.) I believe the engine had a bottom end rebuild by whifbitz a few years back, and has clevite Big end bearings. It has been tuned to a 2.5" exhaust so will prob go with whifbitz 3" setup now and get re-tuned. Or would i be better off sticking with 2.5"? Only thing i don't like is going 3" DP into 2.5" midpipe. From what i can gather so far, it's standard over the top Intake manifold, whifbitz exhaust mani with turbosmart wastegate, 3" downpipe, screamer pipe, stock injectors and coils. Aeromotive FPR, Link ECU and 3 bar map sensor, NA Oil pump. Basically the full whifbitz NA-T setup c/w Side mount intercooler. Aftermarket oil cooler, HKS BOV. https://www.garagewhifbitz.co.uk/garage-whifbitz-na-t-supra-turbo-kit/ So the engine is currently on the stands but will be used for drifting so quite alot of mid-high rev range action in short bursts, can you guys recommend anything to do while it's out of the car? No, i don't want to forge it.. (yet anyway) but i've heard that changing to GTE Headgasket might be a good idea and not sure if anything else will be worth doing before it goes back in? Obviously i'm mindful that it's stock block so don't want to overdo it by adding uprated injectors, coils etc as i think 420hp is more than plenty for the use i'll get In regards to the screamer pipe, i think it's going to be an issue potentially for noise limits, what's best option in regards to this? Edited July 29 by tayr (see edit history) Quote Link to comment Share on other sites More sharing options...
Style Posted July 29 Share Posted July 29 That's an odd looking graph with the bump at around 4200rpm. Might be worth fresh plugs, leads and a good service to try and see what's happening there. If you're happy with the power just now, don't go changing the headgasket as you'll just make it less responsive and need more boost to make the same power. It'll have uprated injectors/pump in it already if it's making that amount of stink. So yeah, a damn good service and let it rip really. For the screamer pipe, re-circulating it back into the downpipe and then bring the noise down on the whole thing with silencers is probably the best bet. 1 Quote Link to comment Share on other sites More sharing options...
tayr Posted July 29 Author Share Posted July 29 (edited) 46 minutes ago, Style said: That's an odd looking graph with the bump at around 4200rpm. Might be worth fresh plugs, leads and a good service to try and see what's happening there. If you're happy with the power just now, don't go changing the headgasket as you'll just make it less responsive and need more boost to make the same power. It'll have uprated injectors/pump in it already if it's making that amount of stink. So yeah, a damn good service and let it rip really. For the screamer pipe, re-circulating it back into the downpipe and then bring the noise down on the whole thing with silencers is probably the best bet. Thanks mate, yeh i know nothing about dynos really but it didn't make alot of sense to me. I can't see any note of uprated injectors anywhere though so i'm not 100% sure Reckon it's worth going FFIM at same time? Edited July 29 by tayr (see edit history) Quote Link to comment Share on other sites More sharing options...
Style Posted July 30 Share Posted July 30 17 hours ago, tayr said: Thanks mate, yeh i know nothing about dynos really but it didn't make alot of sense to me. I can't see any note of uprated injectors anywhere though so i'm not 100% sure Reckon it's worth going FFIM at same time? Yeah it seems weird, shouldn't really be losing power like that in the mid range. Not to worry re injectors etc I guess if you're happy with the power for now I wouldn't really worry too much about the FFIM at that level, it's a looks thing more than anything unless you're needing to whip it off all the time to do plugs/leads or something. A front mount intercooler might be a good option though if you're going to be drifting it. It's possible the SMIC won't get a great deal of airflow if the car is travelling slower than the wheels are spinning Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted July 30 Share Posted July 30 The dip is the ACIS valve opening on NA, normal. 1 Quote Link to comment Share on other sites More sharing options...
tayr Posted July 30 Author Share Posted July 30 1 hour ago, Mike2JZ said: The dip is the ACIS valve opening on NA, normal. Will it feel like a lack of power momentarily? Annoyingly potentially at a sh!t spot in the rev range Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted July 30 Share Posted July 30 Delete the ACIS valve completely if you dont want it, you will just loose some low down torque. Its more of a thing for NA engine, normally on turbo it becomes a bit of hinderance / useless depening on the setup. If the ACIS valve VSV is connected to the ECU you can "map" it to a degree, but there is still some mechanical lag of the valve actually opening. Quote Link to comment Share on other sites More sharing options...
tayr Posted July 30 Author Share Posted July 30 1 hour ago, Mike2JZ said: Delete the ACIS valve completely if you dont want it, you will just loose some low down torque. Its more of a thing for NA engine, normally on turbo it becomes a bit of hinderance / useless depening on the setup. If the ACIS valve VSV is connected to the ECU you can "map" it to a degree, but there is still some mechanical lag of the valve actually opening. Thanks mate I think as it will be used for drifting probably not the best thing to have. Will look up how to remove it tomorrow. Thanks again Quote Link to comment Share on other sites More sharing options...
tayr Posted July 31 Author Share Posted July 31 Going to get a head start and get some cam cover gaskets as it's weeping and new plugs. Any plug recommendations? Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted July 31 Share Posted July 31 BKR7EIX 1 Quote Link to comment Share on other sites More sharing options...
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