Yowzer Posted November 8, 2013 Share Posted November 8, 2013 Why would you remove VVT? I guess in a race situation you're always running in the top RPM range which makes it somewhat unnecessary, but is there any advantage in removing it as opposed to utilizing it? Talking full on race spec situ here (unless rules state no VVT) Quote Link to comment Share on other sites More sharing options...
Yowzer Posted November 8, 2013 Share Posted November 8, 2013 Actually this is getting off topic. Quote Link to comment Share on other sites More sharing options...
Roman Posted November 8, 2013 Share Posted November 8, 2013 4 Quote Link to comment Share on other sites More sharing options...
kpr Posted November 8, 2013 Share Posted November 8, 2013 fake edit: beaten but anyway; only time you would want to remove it, is if the cams are too big for it to work. valves eat pistons etc. eg, the vvt pulley has somthing like 30degrees travel. dial in your correct retard on the inlet cam. (resting position) then hit the vvt, it advances 30degrees and bends some valves. also its a pretty basic on off system, if you look at it one way. i cant remember the numbers, but it turns on at say 2000rpm. and switches back off at 7000 rpm. so if you advanced the cam to the vvt "on" setting, fixed it at that. the only place you would lose power is over 7000rpm. and it would idle like junk. 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted November 8, 2013 Share Posted November 8, 2013 ^^There's a lot of benefit to advancing the cam (or not) based on load as well though, so you pretty much get a more miserable fuel bill disabling it too. (Assuming your ECU has a load vs rpm table for it I guess)there was a guy who built a turbo Altezza motor with Supra pistons - which have different shaped valve reliefs.Checked all of the clearances when buildint the motor and it was fine, but then started tuning and advanced the cams - crunch! woops 1 Quote Link to comment Share on other sites More sharing options...
bobdylan Posted November 8, 2013 Share Posted November 8, 2013 Thanks guys, feel like a muppet now. Roman cheers for the flow chart. seen the error in my ways. Only reason i was going to disable is the set of cams i have my eye on say they can't be used with vvt. Going to have to rethink the usage of them. Maybe stick with kelford 193b or similar. Quote Link to comment Share on other sites More sharing options...
feavermj Posted November 8, 2013 Author Share Posted November 8, 2013 this is the car here..... //oldschool.co.nz/index.php?/topic/40808-matts-ke25-4age-sr-coupe/ Quote Link to comment Share on other sites More sharing options...
kpr Posted November 8, 2013 Share Posted November 8, 2013 ^^There's a lot of benefit to advancing the cam (or not) based on load as well though, so you pretty much get a more miserable fuel bill disabling it too. (Assuming your ECU has a load vs rpm table for it I guess) yeh at cruise would be benifits fuel economy wise, with levaing the vvt off. (in retarded position - less overlap.) my reply was more just aimed at full throttle/ yowzer's full race spec question Quote Link to comment Share on other sites More sharing options...
Truenotch Posted November 8, 2013 Share Posted November 8, 2013 I think you should get a megasquirt. 1 Quote Link to comment Share on other sites More sharing options...
bobdylan Posted November 8, 2013 Share Posted November 8, 2013 I think you should get a megasquirt. I do agree but if funds lack the Honda option is just as good Quote Link to comment Share on other sites More sharing options...
Bling Posted November 8, 2013 Share Posted November 8, 2013 What is the total budget for this? Quote Link to comment Share on other sites More sharing options...
bobdylan Posted November 8, 2013 Share Posted November 8, 2013 What is the total budget for this? Wonder why i never thought to ask that question. Quote Link to comment Share on other sites More sharing options...
Bling Posted November 9, 2013 Share Posted November 9, 2013 Pretty important question I think. What does the Honda route cost? Quote Link to comment Share on other sites More sharing options...
bobdylan Posted November 9, 2013 Share Posted November 9, 2013 Pretty important question I think. What does the Honda route cost? If he does the wiring maybe $180 for the loom and Honda parts (trademe and pick a part) and $200-300est for tuning. For the 92 is was just under 500 all up and running. Maybe he should join a Toyota forum. There is one big one in Australia but not sure about nz. Quote Link to comment Share on other sites More sharing options...
feavermj Posted November 9, 2013 Author Share Posted November 9, 2013 not a massive budget was kind of wanting something I didn't have to pay someone a lot to tune. But scince that kind of thing is not available I would be keen to pump maybe $1k into something that would be able to handle a mildly worked 4age. only thinking of doing proper cams and ITBs, so would it be better for me just to go for a standard black top ECU and ITBS, or ITBS and Megasquirt? Quote Link to comment Share on other sites More sharing options...
bobdylan Posted November 9, 2013 Share Posted November 9, 2013 Blacktop ecu is designed for 20v engine. Never seen it work great on a 16v. TBH if you want to go Blacktop ecu better go Honda Ecu or aftermarket. What's the goal? track, rally or road? Quote Link to comment Share on other sites More sharing options...
feavermj Posted November 9, 2013 Author Share Posted November 9, 2013 Goal is a street car only. Will never be competing if it ends up on the track. It goes good the way it is but always toying with ideas of more power but want to keep n/a. Quote Link to comment Share on other sites More sharing options...
kpr Posted November 9, 2013 Share Posted November 9, 2013 will this honda ecu operate in alpha n (tps vs rpm) mode? Quote Link to comment Share on other sites More sharing options...
feavermj Posted November 9, 2013 Author Share Posted November 9, 2013 what is a good cam upgrade without making any other modifications to the head? Make of Cams? and Degree ? Quote Link to comment Share on other sites More sharing options...
bobdylan Posted November 9, 2013 Share Posted November 9, 2013 will this honda ecu operate in alpha n (tps vs rpm) mode?Yes. Either the old map vs rpm or alpha-n tps vs rpm. It's just an obd1 ecu with a rtp chip. Alpha-n is just rpm/temp and tps if i remember correctly. Plus the bonus is its rtp over write and play. Crome has an itb tool which converts to alpha-n. And its pretty easy to use. Quote Link to comment Share on other sites More sharing options...
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