Honda Prelude Forum
 
Go Back   Honda Prelude Forum > Tech-Talk > General Tech Talk

Thread Title
Need programmed ECU - vtec? (Paying)

 
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 07-17-2010, 11:42 PM
Terror's Avatar
Silver Member
 
Join Date: Jul 2010
Posts: 375
iTrader: (0)
Terror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond repute
Need programmed ECU - vtec? (Paying)

Hello; first off I'm new to the import / prelude scene, so I apologize ahead of time in case I say something stupid.

My original plan was to buy a prelude body for about a grand (whatever engine; pref blown for price), and do the JDM H22A swap. I came across a 93 Si prelude with the swap already done, needing a few mechanical fixes, for only 1400. So I picked that up for now.

The body has 190k, and the previous owner estimated 90k-100k miles on the current H22A engine & trans.

With the engine having some miles on it, the strain of redlining becomes more of a concern. To the point- the vtec wont engage until 5-5.5 rpm. Would getting a modded ECU to engage the vtec at lets say 3-3.2 rpm put less strain on the engine? I've heard arguments that lowering the rpm's needed for the vtec to kick in could be bad as the engine needs the spin of 5+ for it to properly work.

I'm just trying to baby the engine as much as I can until I'm ready to do a clean swap. I understand racing isn't the smartest approach if you want to make an engine last, but you guys know what its like, I'll want to step on it anyway.

I'm willing to pay someone to mod the ecu for me, if what I said made any sense.
Reply With Quote
  #2 (permalink)  
Old 07-18-2010, 12:28 AM
dbd6604's Avatar
I wish I was Kat Dennings' bra

 
Join Date: Jul 2008
Location: Quad-Cities, IL
Posts: 5,979
iTrader: (17)
dbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond repute
Re: Need programmed ECU - vtec? (Paying)

If you're worried about the engine that much, just rebuild it. Also, VTEC engagement has nothing to do with how worn the engine it. It is set to engage at 4900 or 5200 (depending on the year), as long as it meets certain prerequisites (Speed, coolant temp). If you were to get a chipped ECU (P28 and P72 are your best options), you would need to get it tuned to find the proper VTEC engagement point. The way it is done is like so: You set VTEC engagement extremely low (2000ish RPMS), and make a pass on the dyno. Next, you set it extremely high (7000ish RPMS), and make another pass on the dyno. You overlap the two dyno graphs, and wherever the torque curves cross is where you should set your VTEC engagement. It's as simple as that. Some engine management programs even allow you to set a TPS threshold so VTEC doesn't engage when you don't want it to (i.e. you have a high FD gear and cruising at 80 on the highway would put you in VTEC ). There are lots of options out there, so make sure to do your research!

Quote:
I'm willing to pay someone to mod the ecu for me, if what I said made any sense.
As far as getting ahold of a new ECU, you can go to Phearable.net and get what you need for a really good price. There are also a few great sellers on E-Bay who sell chipped Honda ECU's. Just make sure if you drive on a basemap (which you shouldn't, but you may need to drive to the tuner), BABY IT. When running a chipped ECU, it is MANDATORY that you get it tuned before driving the car for any length of time.
__________________
Prelude Enthusiast: [prel-yood, preyl-, prey-lood, pree-lood], [en-thoo-zee-ast, -ist] noun: Someone who is willing to do whatever it takes to push the envelope, performance wise or stylistically, all the while brushing their shoulders off in a truly pimp-esque manor.

See also: Automotive Pioneer
Reply With Quote
  #3 (permalink)  
Old 07-18-2010, 11:07 AM
Terror's Avatar
Silver Member
 
Join Date: Jul 2010
Posts: 375
iTrader: (0)
Terror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond repute
Re: Need programmed ECU - vtec? (Paying)

Ah I see.

At that point it might just be better to leave it as it is, and I'll get a modded ecu once I do the rebuilt swap.

The general idea was to engage the vtec at a lower rpm so I wouldn't need to rev the engine so high to get the power band. IE; granny shift it at 2.5-3 when cruising, higher end shift at 4-6 when racing. I wouldn't have to shift at the redline or near it, thus cutting the engine a small break.

But thank you for the info, I hadn't thought about the dyno. I'll keep it as is right now, and work on making the outside nice. When the engine blows (if it does) I'll have the money set aside to get another, and do the performance upgrades before it goes in.

The car did sit for a year and a half, how long should I granny it till I start stepping on it? Loosen all the kinks.
Reply With Quote
  #4 (permalink)  
Old 07-18-2010, 11:31 AM
dbd6604's Avatar
I wish I was Kat Dennings' bra

 
Join Date: Jul 2008
Location: Quad-Cities, IL
Posts: 5,979
iTrader: (17)
dbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond repute
Re: Need programmed ECU - vtec? (Paying)

Quote:
The general idea was to engage the vtec at a lower rpm so I wouldn't need to rev the engine so high to get the power band. IE; granny shift it at 2.5-3 when cruising, higher end shift at 4-6 when racing. I wouldn't have to shift at the redline or near it, thus cutting the engine a small break.
Lowering VTEC engagement for the sake of "babying" the motor is a ridiculous idea. Not trying to be a dick or anything, but it's the truth. If you're attempting to baby the motor, do just that, baby it. You know what they say...you can't have your cake and eat it too.
__________________
Prelude Enthusiast: [prel-yood, preyl-, prey-lood, pree-lood], [en-thoo-zee-ast, -ist] noun: Someone who is willing to do whatever it takes to push the envelope, performance wise or stylistically, all the while brushing their shoulders off in a truly pimp-esque manor.

See also: Automotive Pioneer
Reply With Quote
  #5 (permalink)  
Old 07-18-2010, 04:54 PM
BrickDiver's Avatar
Silver Member
 
Join Date: May 2010
Location: Massillon, Ohio
Posts: 389
iTrader: (0)
BrickDiver has a reputation beyond reputeBrickDiver has a reputation beyond reputeBrickDiver has a reputation beyond reputeBrickDiver has a reputation beyond reputeBrickDiver has a reputation beyond reputeBrickDiver has a reputation beyond reputeBrickDiver has a reputation beyond reputeBrickDiver has a reputation beyond reputeBrickDiver has a reputation beyond reputeBrickDiver has a reputation beyond reputeBrickDiver has a reputation beyond repute
Re: Need programmed ECU - vtec? (Paying)

Take a look at this article:

It's for integra's but it explains VTEC very well

All About VTEC - Team Integra

It explains why VTEC engages when it does. Bottom line, your engine engages VTEC at that RPM because that is the optimum timing for the STOCK H22. If your engine is heavily modified and you are forcing more air in at lower RPM's, then go for it, lower it. But if your engine is stock, then don't bother, you'll just end up losing power.

It's the same thing with guys running TODA VTEC Killer Cams, which essentially remove the low profile lobes and replace them with high profile lobes, so you are in VTEC constantly. There is no power below 6k RPM's, so it isn't good for a daily, but in track circumstances, they work great. But they are made for heavily modified engines, not your stocker.
Reply With Quote
  #6 (permalink)  
Old 07-19-2010, 11:39 AM
Terror's Avatar
Silver Member
 
Join Date: Jul 2010
Posts: 375
iTrader: (0)
Terror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond reputeTerror has a reputation beyond repute
Re: Need programmed ECU - vtec? (Paying)

Alright, sorry for the ignorance.

My friend has a prelude h22 vtec and its a sweet car. Got me into wanting one, so after cruising in his for awhile I got the money to get my own.

I'm learning as I go.

I've had an accord up till now.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Late VTEC engaging leads to no VTEC, CEL, and ATTS lights... sightnsound General Tech Talk 7 08-04-2009 05:37 PM
Hard work paying off (updated Pics) RedRocket6 Auto Showoff 19 04-14-2009 12:38 PM
Paying a little respect... T.E.L. Auto Showoff 18 06-25-2008 01:42 AM
How much should I be paying for a 5th? DRBagabundo 5th Gen Honda Prelude 17 09-22-2007 02:28 PM


All times are GMT -4. The time now is 07:58 AM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors


Copyright © 2006-2009 PreludeZone.com All Rights Reserved.