LaurelPWR Posted March 25, 2014 Share Posted March 25, 2014 Just converted my rb25 s13 to e85. the car feels a lot faster but should it be making full boost sooner??? also puzzled at how boost and power comes on later than the bp98 ..... Has the following mods: Standard rebuilt rb25 acl bearings arp bolts throughout tomei poncams hks ex cam gear +8 i think hks gtrs turbo kit on standard manifold, custom japan made r32 gtr 6 throttle plenum retains standard side feeds high flowed 740cc greddy cooler apexi induction kit and pod turbosmart plumb back bov 3inch turbo back exhaust 100cell cat straight through to twin cannons power fc walbro 460 tomei fpr koyo rad and greddy oil cooler blitz spec r boost controll excedy light flywheel nismo 2way lsd etc...etc.. the bottom red line in dyno 1&2 is the bp98 18psi the middle pink line in dyno 1&2 is E85 on the same boost the top orange line in dyno 1&2 is E85 20psi and some tweaking dyno 3 is just differant boost settings after it was tuned obviously.... Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/ Share on other sites More sharing options...
RBrennan25 Posted March 25, 2014 Share Posted March 25, 2014 What do you use the car for? If it's a daily made he backed off the spool time a little bit so you don't end up pointing the wrong way down the street after a round about? It is still making more power despite less boost (to be expected with the e85). Maybe he was having traction issues, or clutch slip, or something similar. That turbo would come onto boost pretty freaking hard so did the tuner mention anything about that? Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7238977 Share on other sites More sharing options...
Blackkers Posted March 25, 2014 Share Posted March 25, 2014 (edited) What do you use the car for? If it's a daily made he backed off the spool time a little bit so you don't end up pointing the wrong way down the street after a round about? "backed off the spool a little bit" couldn't help but laugh a bit sorry mate. E85 won't make the turbo boost earlier. It makes slightly more power for the same amount of air. Air is what spins the turbo though. Should be about the same response wise just faster on boost. edit: It looks slightly laggy for your set up though, I don't know what ramp rate the dyno operator was using. hard to compare that to the street. You could try preloading the wastegate slightly or increasing the GAIN setting on your eboost controller Edited March 25, 2014 by Blackkers Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239003 Share on other sites More sharing options...
RBrennan25 Posted March 25, 2014 Share Posted March 25, 2014 Yeah certainly no mechanic Basically what I mean though, the gain on the boost controller was turned down. I've heard of people with e85 and a gt ss and the word 'undriveable' was thrown around a lot, there was just too much torque and it drove like it was on ice. Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239017 Share on other sites More sharing options...
Ben C34 Posted March 25, 2014 Share Posted March 25, 2014 Ask tuner why. Then you will know. I wouldn't be happy with later spooling on e85 tune. Perhaps that's why the afr is not shown on the plot..... cos that's what you should be interested in, boost you can see for yourself on the road. (They don't tune the boost, they tune the afr and timing) Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239059 Share on other sites More sharing options...
Badgaz Posted March 25, 2014 Share Posted March 25, 2014 "backed off the spool a little bit" couldn't help but laugh a bit sorry mate. E85 won't make the turbo boost earlier. It makes slightly more power for the same amount of air. Air is what spins the turbo though. Should be about the same response wise just faster on boost. edit: It looks slightly laggy for your set up though, I don't know what ramp rate the dyno operator was using. hard to compare that to the street. You could try preloading the wastegate slightly or increasing the GAIN setting on your eboost controller he could turn gain down on the boost controller to make it spooler slower couldn't he? Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239090 Share on other sites More sharing options...
Ben C34 Posted March 25, 2014 Share Posted March 25, 2014 But why would he? That's stupid. Everyone wants early spool. Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239095 Share on other sites More sharing options...
LaurelPWR Posted March 25, 2014 Author Share Posted March 25, 2014 It's mostly a street car but fully equipped for drift...it's feels noticeably faster actually driving it on the street now (e85) then before on bp98.. I am now having even more trouble getting any good amount of power to the road without wheel spin (rsr semies) It had year old good tyres on when was on the dyno....one did internally delaminate towards the end tho haha.... Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239258 Share on other sites More sharing options...
Badgaz Posted March 25, 2014 Share Posted March 25, 2014 are you running stupid amounts of rear camber? Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239273 Share on other sites More sharing options...
Anfanee Posted March 26, 2014 Share Posted March 26, 2014 400HP and spinning wheels with semi slicks? Yeah right. What suspension are you running or as said camber? There is no way you should be losing traction with that power. Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239282 Share on other sites More sharing options...
discopotato03 Posted March 26, 2014 Share Posted March 26, 2014 My experience with a GTRS on a 25 with E70 was it wanted to boost at 2200 revs and it felt like it couldn't breathe and did the ethanol "wobble" thing . I suspect that until the waste gate cracks open there is more air going in than the turbine housing itself can pass out so you get I suppose a locked up volume situation that the engine can't handle unless you back off or allow the gate to crack open at that point . You can drive a GTS25T up some surprising grades in 5th gear and silly low revs with a GTRS and E70/85 - if you can get the exhaust out through the combined housing and gate . If you go with the stay shut f**k you gate theory I think you'll choke the thing at low revs trying to get boost in when the engine can't really use it . The surge slotted compressor housing gets around compressor surge issues but you really need the gate to crack early and some electronic means of boost control to get adequate exhaust flow out of the engine . Really people have to think about how much boost you jamb into an engine at low revs and how much it pays off - or doesn't actually . If you had a multi needle gauge showing boost and exhaust manifold pressure you'd be surprised what happens at times . I never ran my GTRS on straight PULP but I'm sure the ahh hot side restrictions would have shown up as detonation and countering that would stop you forcing them into boost at real low revs . Ethanol is good stuff but I reckon it can resolve detonation issues in a setup that's trying to tell you it has a problem . I'm choking even if I'm not detonating ... A . Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239313 Share on other sites More sharing options...
LaurelPWR Posted March 26, 2014 Author Share Posted March 26, 2014 400HP and spinning wheels with semi slicks? Yeah right. What suspension are you running or as said camber? There is no way you should be losing traction with that power. It's a set up drift car it has adjustable and solid everything (bushes/arms) and a fair bit of body bracing/rollcage/heavy as swaybars and yes it runs a fair bit of camber can't remember exactly how much but I run shitty rotas 18x10 and 18x12...... Don't forget it's 400whp rb25 s13 mostly stripped out for weight reduction it had no problems spinning the semis befor e85 Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239465 Share on other sites More sharing options...
LaurelPWR Posted March 26, 2014 Author Share Posted March 26, 2014 Also forgot to mention Matty put a sensor in the o2 plug on the dump and measured 4psi of back pressure at 20psi boost.... I'm installing a flanged allflow non cat and having smoke machine boost leak test done by a friend in the next few weeks and then back to Matty at pits for a re tune and to tune the throttles as well so well see how all that goes lol Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239579 Share on other sites More sharing options...
jake26 Posted March 26, 2014 Share Posted March 26, 2014 Posting for notifications Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239620 Share on other sites More sharing options...
scotty nm35 Posted March 26, 2014 Share Posted March 26, 2014 Also forgot to mention Matty put a sensor in the o2 plug on the dump and measured 4psi of back pressure at 20psi boost.... I'm installing a flanged allflow non cat and having smoke machine boost leak test done by a friend in the next few weeks and then back to Matty at pits for a re tune and to tune the throttles as well so well see how all that goes lol Is the bong smoke machine under pressure? If not, don't even bother, just make a bung and cram some air into it. 20psi should do nicely if you can keep it in there. Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239673 Share on other sites More sharing options...
LaurelPWR Posted March 26, 2014 Author Share Posted March 26, 2014 Is the bong smoke machine under pressure? If not, don't even bother, just make a bung and cram some air into it. 20psi should do nicely if you can keep it in there. Yeah man it is under pressure.... a friend at VAGarage has one he uses regularly to test and fix all the Audi/vw turbo cars he works on Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239685 Share on other sites More sharing options...
scotty nm35 Posted March 26, 2014 Share Posted March 26, 2014 lol. VAG. I still don't understand why you would need the smoke, I test intakes all the time and have no issue finding leaks with plain air, I just figured it was a way of charging more for what should take 10 seconds with a compressor. Try 40psi if you want to find them easier. Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239691 Share on other sites More sharing options...
LaurelPWR Posted March 26, 2014 Author Share Posted March 26, 2014 hahahaha vag.....nice yeah your probably right about the smoke but its free and works a treat and i currently don't have a working compressor lol Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239790 Share on other sites More sharing options...
Badgaz Posted March 26, 2014 Share Posted March 26, 2014 some water and liquid soap in a spray bottle works mint too. Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7239906 Share on other sites More sharing options...
LaurelPWR Posted March 27, 2014 Author Share Posted March 27, 2014 some water and liquid soap in a spray bottle works mint too. Yeah tried this it does the job too but when you fit a set of gtr throttles to an rb25 there are a lot o extra vacuum lines under the plenum you can't get to so the smoke test is all round easier (: Link to comment https://www.sau.com.au/forums/topic/441053-should-my-hks-gt-rs-be-making-boost-earlier-e85/#findComment-7241380 Share on other sites More sharing options...
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