I think the 14b comp wheel should be fine, sounds like you are after a smaller exhaust wheel to reduce lag..... Or am I completely wrong?
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| Turbo and Exh man setup http://4g61t.org/forum/viewtopic.php?f=6&t=6088 |
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| Author: | switch [ Sun Nov 09, 2003 11:29 pm ] |
| Post subject: | Turbo and Exh man setup |
Hi guys, Im down grading my current turbo setup as its too laggy... Ive got an evo3 exhaust manifold and a 14b ported to match eachother currently... ohh - this is on a 4g61t I want torque and faster spool up more then anything else... hence im down grading to a 13g - should I keep the evo manifold or go back to the 4g61t manifold??? Mike |
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| Author: | notahonda [ Mon Nov 10, 2003 3:21 am ] |
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i would figure use of bigger manifold (Evo 3 manifold) has more exhaust gas flow, which in turn--> results into faster spool up of turbo, especially with a sized turbo such as a 13g... |
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| Author: | switch [ Mon Nov 10, 2003 3:36 am ] |
| Post subject: | |
Hmmm - I thought that it would take longer to spool as the runners etc are bigger and hence it takes longer to full the runners with gases before they start turning the turbo??? |
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| Author: | 89 mirage evo [ Mon Nov 10, 2003 3:39 am ] |
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keep in mind also that a bigger manifold can reduce flow velocity. the evo manifold might be too big, but it should be fine. |
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| Author: | GSRWRC [ Mon Nov 10, 2003 4:23 am ] |
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I think the 14b comp wheel should be fine, sounds like you are after a smaller exhaust wheel to reduce lag..... Or am I completely wrong?
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| Author: | Guest [ Mon Nov 10, 2003 8:17 am ] |
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The smaller exhaust manifole will decrease lag, since the velocity will be higher. Your top end will suffer though, which it sounds like you're fine with. |
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| Author: | pisces [ Mon Nov 10, 2003 11:04 am ] |
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If you're downgrading to a 13G I'd recommend picking up the manifold that the turbo was originally attached to. 13Gs have an off-center turbine inlet in relation to the bolt pattern to the manifold, whereas 14Bs have an on-center turbine inlet. You CAN use the Evo manifold, but there'll be quite a ridge going from the exhaust manifold outlet to the turbine housing inlet. No way to port that baby out! Just some info on the turbo and manifold for ya. I'm not OVERLY familiar with the 61T, but the 14B with an Evo manny ought to be a very good combo. A 63T can spool up a 14B in no time flat. I can't imagine .4L would make all that much of a difference. Are you sure it's not a tuning issue? I like to lean out the lower RPMs a bit to promote quicker spool. You'll run a touch hotter down low, but nothing to be overly concerned about. Just a thought for ya. And as always, tune intelligently, watch your gauges, YMMV, IMHO, etc..etc...etc... |
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| Author: | switch [ Tue Nov 11, 2003 8:37 am ] |
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Thanks for the suggestions guys. GSRWRC : Yes - what I want to do is reduce lag! that is the primary objective! Jmauld - yep im fine with top end suffering - its a street car - I dont like speeding - seen too many accidents! I just want torque to beat the v8's up to the speed limit  Pices - Im going to use the stock 4g61t mainfold - I mock fitted the turbo to it and it lines up perfectly. And I think it is a tuning issue too... Ive got 450cc injectors - GVR4 computer - Evo 1 AFM - 14b - and Evo exh manifold and its all untuned! Tomorrow im getting the timing belt/pulleys/tensioner/Waterpump and various seals done so that I can get it on the dyno for some tuning... The w/pump has been leaking and its too close to 100kms for comfort to take it onto the dyno at the moment (Ive learnt the hard way and have snapped a tbelt before) Its going to cost me 1.1k all up though  so ill have to wait another 2 weeks before I can afford to get it on the dyno to be tuned! After its tuned ill see how it goes and then ill make a decision whether or not to downgrade!Geez what a long post! Mike |
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| Author: | pisces [ Tue Nov 11, 2003 11:25 am ] |
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Quote: Pices - Im going to use the stock 4g61t mainfold - I mock fitted the turbo to it and it lines up perfectly. And I think it is a tuning issue too... Ive got 450cc injectors - GVR4 computer - Evo 1 AFM - 14b - and Evo exh manifold and its all untuned!
I was thinking of the 13G that comes on auto tranny equipped Talons, Eclipses and Lasers. The exhaust manny is VERY small and has a weird offset outlet. The 4G61T exhaust manny must be a bit different. The injectors, computer, MAS/AFM, and turbo all should work VERY well together. That's pretty much a stock setup on a T/E/L and GVR-4. It shouldn't take all that much tuning to get the car running well as the computer is looking for 450 injectors (which you have). Are you using anything presently for fuel/spark tuning?
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| Author: | dragstr4g61t [ Tue Nov 11, 2003 2:51 pm ] |
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I have a 13B on my 4g61t Mirage. It bolted straight onto the stock manifold fine with a minor bending of one of the coolant return line. I used the 13B O2 sensor housing and the rest of the exhaust is stock. The only thing is that the down pipe heat shield made contact with the oil pan so I removed them and got rid of that very annoying little vibration. I'm still running stock injectors at 14# of boost, but I am also in Denver where a lack of oxygen typically makes cars run rich. I like this set up and it is real cheap since you don't need as many parts as you do for the 14B. |
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| Author: | switch [ Tue Nov 11, 2003 4:52 pm ] |
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Pices - I have an Apexi safc and ITC but they have never been tuned as explained... Good news is I jsut dropped off the car at the mechanics to get the work done after this im going to take it to a Subaru dealer (I know its sacreliege!) but the tuner there has been tuning apexi equipment for over 10+ years and he is meant to be really good!!! dragstr4g61t - Where did you get a 13b from? ive got a 13g which is from a 1.8 dohc mitsu engine - a 4g93t. I found the 14b cheap to install - all I needed was exh man (180 for evo) new front pipe (150) oil and water lines and actuator and the turbo itself! Mike |
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| Author: | styler93gsx [ Tue Nov 11, 2003 6:26 pm ] |
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damn man I wouldn't change out that turbo. I would seriously just go get it tuned a bit differently. Or try a ebc. They hold the wastegate shut completely until you reach your designated boost. What does your topend feel like. |
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| Author: | switch [ Tue Nov 11, 2003 7:36 pm ] |
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I have an ebc - a Greddy Profec A... I must say top end is awesome - but it doesnt get there quick enough!!! BUt yeah - a tune hopefully will sort it out... |
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| Author: | switch [ Wed Nov 12, 2003 5:48 am ] |
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Woohooo I got the car back Only gripe is the solid polyurethane rear engine mount is making the car shake like crazy - i guess ill get used to it... When driving and looking in the rear view mirror - its all a haze!!! because the cars vibrating so much! Cant wait to get it dynoed now! |
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| Author: | dragstr4g61t [ Thu Nov 13, 2003 6:09 pm ] |
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I got the 13B from another 4g61t user MIRAGEDOHCTURBO. You will need the O2 sensor housing but use the 11B manifold. It made quite a bit of difference from the 11B to the 13B. I beat a friends DSM with a ton of mods and a 16G from a roll. I can hang with another C/M that has the 4g63 w/big 16G. I might just be better tuned for the turbo but whatever it is my little 61 screams now. |
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