Nic Posted November 26, 2002 Share Posted November 26, 2002 The HKS dealer in HK has just opened a new workshop and fitted the first/only dyno here. I was having mis-fire problems after my engine rebuild so took my car along to get them to try to diagnose the problem. They ran my car on the dyno and found 2 problems, the first was that the wastegate actuator was not holding the boost over 1bar, the second was that the fuel regulator was shot and was causing the mixture to run lean. I had a new stronger actuator, fuel regulator and a GReddy e-manage ECU fitted, the garage then suggested that I get the turbos set up in parallel. I went along with their advice and then watched as they ran my car on the dyno to set the timing and fuelling. It is well exciting watching your car on the rollers as they take it up through the gears until the rear wheels are going mental:eek: The moment of truth was test driving my car after they had finished setting it up. The first thing I noticed was the different exhaust note when I fired it up; I never use to think the exhaust was that loud before, but now it had a really deep rumbling noise to it at tickover and had a sinister growl when the throttle was blipped. Pulling away the car felt obviously different, rather than getting the initial pull and then the kick when the second turbo came in. Now the power delivery at low rpm was very smooth and strong until the engine hit about 3000rpm then all hell broke loose as both turbos spun up together up to 1.4bar. :)It felt good, very smooth and very powerful, then just as I thought my grin couldn't get any bigger I backed off and dropped down a gear 'bang....pop.....pop', came the appreciative sound from the exhaust on over run.... The garage gave me the dyno graphs of my car, the first was the initial run they did on the dyno and it showed the two peaks as each turbo came in in sequence and max'd at 340hp. The second graph was a power run after they had set up the turbos in parallel and mapped the timing/fueling, now the graph was one continuous smooth curve and reached a max of 429hp. Once I've scanned the graphs I'll post them so you can see what I mean. I am really happy to finally get my car running well again after the last few months of tearing my hair out in frustration, big thanks to Phil and Chris for all their help in getting my car running sweetly again, cheers guys Quote Link to comment Share on other sites More sharing options...
Terminator Posted November 26, 2002 Share Posted November 26, 2002 Chris and I were chatting about your car the other day he will be pleased. A result at last. Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted November 26, 2002 Share Posted November 26, 2002 Jesus....that is one dyno session that sounds like it was worth every penny. Congrat's Nick. Quote Link to comment Share on other sites More sharing options...
Nic Posted November 26, 2002 Author Share Posted November 26, 2002 The dyno run cost a few pennies but it was cerainly worth every one. I can not tell you how good it is to finally find a tuning place here that know their stuff, the only problem is it now opens up a whole new realm of tuning possibilities :flame Dev Quote Link to comment Share on other sites More sharing options...
Andrew Dunk Shaw Posted November 26, 2002 Share Posted November 26, 2002 Sounds good Nic, is Hong Kong big enough for you and your supra Quote Link to comment Share on other sites More sharing options...
Nic Posted November 26, 2002 Author Share Posted November 26, 2002 Not really, I've tried getting out of 3rd but just keep running of the edge. Shame I can't drive over the border into China that might be big enough! Quote Link to comment Share on other sites More sharing options...
Nic Posted November 26, 2002 Author Share Posted November 26, 2002 Just want to see what happens when I reach 300posts..... Quote Link to comment Share on other sites More sharing options...
Barry Posted November 26, 2002 Share Posted November 26, 2002 Originally posted by Nic Just want to see what happens when I reach 300posts..... JB cancels your membership.!!! Quote Link to comment Share on other sites More sharing options...
Adam W Posted November 26, 2002 Share Posted November 26, 2002 Is the car much slower below 3000rpm or is it not very noticeable? It sounds like a similar power curve to my Mk3, which is ideal in my opinion. I didn't buy a MkIV cos I didn't like the sequential delivery, never thought of doing the true twin mod! Never mind, I've just found out that my turbo is good for 1.6 bar - even BIGGER injectors on my shopping list I think! Quote Link to comment Share on other sites More sharing options...
Nic Posted November 26, 2002 Author Share Posted November 26, 2002 Doesn't feel any slower below 3K, it still accelarates well but it feels a lot smoother, e.g. at 0.3-4bar with both turbos in parallel the power feels similar to the single at 0.8bar but instead of getting a drop in boost as you do when the second turbo comes online on the sequential set up, you just get one huge surge from 3K+ which just seems to increase until 7K. I'll try and scan the graphs tomorrow so you can see the difference in the power curves. I've also noticed that the rev limiter seems to come in slightly later now, I'm not sure if the limit has been adjusted when the e-manage ecu was mapped. Quote Link to comment Share on other sites More sharing options...
randy Posted November 26, 2002 Share Posted November 26, 2002 Nic, Can you explain what you mean by "fuel regulator was shot and was causing the mixture to run lean" Are you talking of the Fuel Pressure Regulator? Was it faulty? Quote Link to comment Share on other sites More sharing options...
Sharpie Posted November 26, 2002 Share Posted November 26, 2002 Good to see you running sweet Nic Quote Link to comment Share on other sites More sharing options...
FaithStalker Posted November 27, 2002 Share Posted November 27, 2002 Nice going Nic - always a good feeling when your finally happy with you car ! Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted November 27, 2002 Share Posted November 27, 2002 Originally posted by randy Nic, Can you explain what you mean by "fuel regulator was shot and was causing the mixture to run lean" Are you talking of the Fuel Pressure Regulator? Was it faulty? Are you taking the piss ? Quote Link to comment Share on other sites More sharing options...
Nic Posted November 27, 2002 Author Share Posted November 27, 2002 Thanks guys, yes very good feeling to get the car running welll again, it's like a second honeymoon at the moment:) Quote Link to comment Share on other sites More sharing options...
Nic Posted November 27, 2002 Author Share Posted November 27, 2002 Randy, yes the problem I was having was with the fuel pressure regulator, it was faulty and causing the mixture to run lean. A new pressure regulator was fitted and this was set up to deliver a higher fuel pressure, the GReddy e-manage was then mapped on the dyno to control the fueling. Quote Link to comment Share on other sites More sharing options...
Nic Posted November 27, 2002 Author Share Posted November 27, 2002 I've just tried to attach the dyno graph but the file is too big, is there anyone who could reduce the size of the image for me so I can post it? Quote Link to comment Share on other sites More sharing options...
Adam W Posted November 27, 2002 Share Posted November 27, 2002 Yep, as long as it's under 1.5 meg email it to [email protected] and I'll shrink and attach it. Quote Link to comment Share on other sites More sharing options...
Druid Posted November 27, 2002 Share Posted November 27, 2002 Or if it's above 1.5m, mail it to me (no limits here), [email protected] Quote Link to comment Share on other sites More sharing options...
Nic Posted November 27, 2002 Author Share Posted November 27, 2002 This is the final power run on the dyno after the turbos were connected in parallel and the fuel/timing was set up. I'm no expert on dyno graphs so would appreciate any comments/opinions. One question, is there anything I can do to keep the power climbing over 5000rpm or is this the limit of the stock turbos? Quote Link to comment Share on other sites More sharing options...
MONKEYmark Posted November 27, 2002 Share Posted November 27, 2002 wow that looks well smart for stock turbos,they are not hybrid stock turbos? did you do a power run before the TTC conversion.would like to see what 1/4 times that will pull.i can see a flux of supra owners going for TTC mode.there is a lot of people in the states do it too.and my mate dunk has done it on his supra.was a bit of lag bottom end then it flys.but i am sure a hard launch of 3000rpm would help loads on an auto that is. nic what other mods you done to your car. well done Quote Link to comment Share on other sites More sharing options...
Druid Posted November 27, 2002 Share Posted November 27, 2002 I see you had your graph converted Nic Was out having dinner, so I didn't respond. Nice numbers tho mate! Iirc, the stock turbos have limits (with respect to pulling rpm), 5000ish rpm sounds about right. Quote Link to comment Share on other sites More sharing options...
Nic Posted November 27, 2002 Author Share Posted November 27, 2002 Cheers Mark No not hybrids, stock j-spec turbos, I thought the figure was pretty good too so questioned the garage about the hp units they used as thought it could be similar to the US dyno figures. From what I could gather the hp units are the same as they use in Japan which I believe are the same as used in the UK, can anyone confirm this? You can see the full spec at member 177 on the registry, the only things missing are the GReddy ECU, new 2jzGTE short block and Chris W rebuilt head. Quote Link to comment Share on other sites More sharing options...
Alex Posted November 27, 2002 Share Posted November 27, 2002 Nic, we need a list of your mods to work out how best to get the figure to level off or rise after 5,000rpm... Though my first thought would be a cam change. Probably 264's - though I don't think 272's will hurt you as you get so much power so early. Wilder the cam the higher the peak but the more you trade off your bottom end grunt. Or just fit a staged shot of NOS! Quote Link to comment Share on other sites More sharing options...
Nic Posted November 27, 2002 Author Share Posted November 27, 2002 Alex, I have i256/e264 HKS cams fitted at the moment, the garage said much the same thing, that if I had 272's fitted the graph would continue to rise instead of dropping off over 5K. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.