hodge Posted November 10, 2010 Share Posted November 10, 2010 (edited) Hi guys I've been doing some poking around on SF on stock(ish) engines and safe power capabilities. Now I know this has been done to death on here but I read this on SF which made me think. Basically on a few occasions I read that the engine could handle more or handle the power better if it was progressive. What I mean by this is it doesn't just come in in 1 almighty bang. So this got me thinking about turbo size. Now the likes of a billet turbo the power is there straight away which will really stress the engine going from nothing to everything. So could an engine be pushed that little bit further with a bigger turbo that takes slightly longer to spool. Hence not giving the engine an instant shock so to speak. I know it's been said many times that around 700hp is about the limit for a stack block, BUT with some artwork from Lee.P these boundaries have been pushed and pushed by Jamie and Jamesys cars. So I'm thinking, with a turbo such as mine GT42-76, which spools a lot slower than the billets these guys were running could the power boundries be pushed that little bit more. Here's my engine spec. I havnt included the fuel system as it needs amending but what do you think. Stock pistons Stock rods ACL main bearings ACL end bearings ACL thrust washers ARP main bolts ARP rod bolts ARP head studs PHR oil pump ATI pulley New Toyota water pump Ported head 264 cams HKS pulleys GT42-76 turbo 1.28 A/R (may be changing to 1.01A/R) Whifbitz manifold Tial 44mm wastegate Screamer 4" exhaust Veilside plenum Veilside 100 throttle body Veilside rail (-6AN duel feed) Aeromotive FPR 1600cc RC injectors Greddy 4 row 4" intercooler pipework. Syvecs Solaris S6 ECU. A/C removal. 25 row oil cooler 10 row PAS cooler Edited November 10, 2010 by hodge (see edit history) Quote Link to comment Share on other sites More sharing options...
Jamesy Posted November 10, 2010 Share Posted November 10, 2010 Good question - but wont changing your A/R to the smaller 1.01 make it spool quicker though mate - you sound like you want to go the other way - slow spool big power- the A/R 1.28 would suit better id have thought Quote Link to comment Share on other sites More sharing options...
hodge Posted November 10, 2010 Author Share Posted November 10, 2010 I don't think a 1.28 A/R will be at full boost until over 5K and I don't think I could live with that to be honest mate. I'll leave it in place for it to be mapped though and see how it goes before I look at changing it. Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted November 10, 2010 Share Posted November 10, 2010 good thread john, im building mine at the moment so might come in handy. i have JE pistons in mine Quote Link to comment Share on other sites More sharing options...
JamieP Posted November 10, 2010 Share Posted November 10, 2010 A slower spooling turbo will be less stressful on the engine for sure, push it hard i say, worst happens fix it. Quote Link to comment Share on other sites More sharing options...
hodge Posted November 10, 2010 Author Share Posted November 10, 2010 A slower spooling turbo will be less stressful on the engine for sure, push it hard i say, worst happens fix it. I was waiting for you to post mate. And your reply was exactly what I anticipated lol. Don't get me wrong, I don't want to pop the engine but I've fitted ARPs all through the engine which are known weak spots in a pretty bulletproof engine as is. On the back of this I would have thought with slower spool 800hp is safely achievable using pump fuel. Quote Link to comment Share on other sites More sharing options...
Bailey. Posted November 10, 2010 Share Posted November 10, 2010 Good thread, what rpm limit are you planning hodge? Quote Link to comment Share on other sites More sharing options...
hodge Posted November 10, 2010 Author Share Posted November 10, 2010 Good thread, what rpm limit are you planning hodge? That's going to be Ryans jobs mate. I'll be leaving it totally in his hands. I trust whatever he thinks best. Quote Link to comment Share on other sites More sharing options...
sdistc Posted November 10, 2010 Share Posted November 10, 2010 This is the technique that most of the Australian tuners use (and Scandinavians too, so I hear) - high boost, low timing = big numbers without race fuel. Quote Link to comment Share on other sites More sharing options...
hodge Posted November 10, 2010 Author Share Posted November 10, 2010 Thunk I'll have a big on supraforums.AU tonight while I'm at work to see what I can find. Quote Link to comment Share on other sites More sharing options...
sdistc Posted November 10, 2010 Share Posted November 10, 2010 There are a few big numbers there.. forums have been dead past year though. Quote Link to comment Share on other sites More sharing options...
hodge Posted November 10, 2010 Author Share Posted November 10, 2010 I've been a member on there for a couple of years but havnt really posted much. I'll see what I can dig up. Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted November 10, 2010 Share Posted November 10, 2010 (edited) PROJECT GOLD RUSH rebuilt and balanced bottom end with stock head JE pistons/rings acl bearings rod bolts new oil pump new water pump (toyota) rod bolts ARP ARP head studs engine gasket set (complete) toyota greddy intake manifold (polished) gates racing cam belt gates racing auxillary belt lexan sparkplug cover not much of a list but ill get the slowly, be with lee at srd at the end of the year for rebuild. Edited November 10, 2010 by Rob_Mitchell (see edit history) Quote Link to comment Share on other sites More sharing options...
Paul Whiffin Posted November 10, 2010 Share Posted November 10, 2010 Hello mate, I think the main problem with your setup will be revs, the GT42 power will still be climing at 8500rpm and you'll be limited to about 7500rpm with stock valve springs/rods/etc. I reckon with that rear housing size on a std stroke engine you wont be getting full boost until around 5300rpm, makes for a very small powerband, not very nice for a road car. Depends on how much power you want to make though? Ta Quote Link to comment Share on other sites More sharing options...
davej705 Posted November 10, 2010 Share Posted November 10, 2010 Nice name for your project mate! PROJECT GOLD RUSH rebuilt and balanced bottom end with stock head JE pistons/rings acl bearings rod bolts new oil pump new water pump (toyota) rod bolts ARP ARP head studs engine gasket set (complete) toyota greddy intake manifold (polished) gates racing cam belt gates racing auxillary belt lexan sparkplug cover not much of a list but ill get the slowly, be with lee at srd at the end of the year for rebuild. Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted November 10, 2010 Share Posted November 10, 2010 paul, on your bw turbo kit i spoke to you about when will the power come in at full boost? what revs roughly? Quote Link to comment Share on other sites More sharing options...
hodge Posted November 10, 2010 Author Share Posted November 10, 2010 If I reduce the size of the A/R to 1.01 Paul what sort of difference would I see to full boost within the rev range. Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted November 10, 2010 Share Posted November 10, 2010 Nice name for your project mate! cheers mate, looking forward to cracking on now, every nut and bolt is being gold plated ha ha, i have to do it now as life is too short and plus i cant have hodge winning every show lol i can happily come second.... until yours hits the scene too Quote Link to comment Share on other sites More sharing options...
davej705 Posted November 10, 2010 Share Posted November 10, 2010 Hodge what's the idea your saying,increase the power more progressively to reduce stress on the engine? Quote Link to comment Share on other sites More sharing options...
hodge Posted November 10, 2010 Author Share Posted November 10, 2010 Just the idea I was getting from supraforums Dave. Instead of all the power coming in all in 1 huge rush with a fast spooling turbo a bigger more laggy turbo will spool slower hence less sudden impact on the engine, well in theory. Quote Link to comment Share on other sites More sharing options...
JamieP Posted November 10, 2010 Share Posted November 10, 2010 Have you done anything with the head other than cams? Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted November 10, 2010 Share Posted November 10, 2010 theory sounds good to me but aint that the point of having twins, i thought people go single for that impact of sudden power which pins you in the seat Quote Link to comment Share on other sites More sharing options...
davej705 Posted November 10, 2010 Share Posted November 10, 2010 Just the idea I was getting from supraforums Dave. Instead of all the power coming in all in 1 huge rush with a fast spooling turbo a bigger more laggy turbo will spool slower hence less sudden impact on the engine, well in theory. Makes sense,someone like cw or jagman would probably be better to comment than me though Quote Link to comment Share on other sites More sharing options...
hodge Posted November 10, 2010 Author Share Posted November 10, 2010 Have you done anything with the head other than cams? I've ported and polished it Jamie. Next I'll be fitting some titanium springs and retainers but will be leaving the stock valves. Quote Link to comment Share on other sites More sharing options...
JamieP Posted November 10, 2010 Share Posted November 10, 2010 I've ported and polished it Jamie. Next I'll be fitting some titanium springs and retainers but will be leaving the stock valves. Id go dual valve springs then up the rev limit to something like 7800-7900 should be plenty of revs for that turbo. I made the mistake of going single supertech valve springs in my last build and we think i was getting valve flutter, my power stopped dead at about 6500rpm where it should still have been climbing fast to my 8200rpm rev limit, running a to light a spring on a big turbo/big rev 2jz wont let the bucket follow the profile and performance is compromised. http://i30.photobucket.com/albums/c338/jamie450x/894bhp002.jpg Its all being changed now and if my power keeps rising this time as it should i hope to hit the 1000bhp mark with ease. Quote Link to comment Share on other sites More sharing options...
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