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Old 05-08-2004, 11:20 AM   #1
Unabomber
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Exclamation Turbo FAQ: Read if you are thinking of upgrading!

Turbo FAQ

Looking for this? http://forums.nasioc.com/forums/show...php?p=17308273 is the new home.
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Last edited by Unabomber; 03-10-2007 at 08:46 AM.
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Old 05-08-2004, 09:21 PM   #2
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Fuel Pump FAQ

Injector FAQ

Fuel Rail FAQ

Looking for these? http://forums.nasioc.com/forums/show....php?t=1218460 is the new home.

Last edited by Unabomber; 03-10-2007 at 08:45 AM.
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Old 05-08-2004, 10:17 PM   #3
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Good job!

Edit: You might want to add www.forcedperformance.net/ to your list of turbo makers.... they make the green and such. I dont like them or how they do bissness but thats beside the point.

Last edited by totoherbs; 05-08-2004 at 10:55 PM.
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Old 05-08-2004, 10:52 PM   #4
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Excellent! We need more definitive resources around here. With all the BS from the management regarding knowledgable non-paying shop owners posting info and greedy merchants not divulging any info, stuff like this is a breath of fresh air.
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Old 05-08-2004, 11:05 PM   #5
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Thanks for the link, I forgot about FP. And probably a few others too, but I am sure I will get reminded.

If anyone sees an obvious error, feel free to let me know by posting or PM me. This post is about accuracy, not my ego, so feel free to help out!

Well, with any luck, there will be a good influx of help with this post. I have been emailing and PMing the death out of some Vendors, tuners, and some fellow "normal people" who are very frequently post in this and other technical forums. I will probably ask for more assistance tomorrow as well. I hope to see a lot of good information come from this post that will help current a future people interested in aftermarket turbos.

Aside from that, more to come tomorrow and for the next few days. Twin scrolls, turbo lag, compressor maps, map reading, and more to come. Stay tuned!
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Old 05-08-2004, 11:48 PM   #6
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You might want to throw in some stuff about intercoolers, or is that beyond the scope of what you want to cover in the FAQ?


Full_Clip knows most people buy FM for the bling factor.
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Old 05-08-2004, 11:51 PM   #7
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Quote:
Originally posted by Full_Clip
You might want to throw in some stuff about intercoolers, or is that beyond the scope of what you want to cover in the FAQ?


Full_Clip knows most people buy FM for the bling factor.
Hes got a front mount and top mount FAQ.... http://forums.nasioc.com/forums/show...hreadid=533787
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Old 05-09-2004, 12:01 AM   #8
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Holy crap.


Full_Clip votes unabomber for mod status.
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Old 05-09-2004, 12:09 AM   #9
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Quote:
Originally posted by Full_Clip
Full_Clip votes unabomber for mod status.
Amen.. he has worked his arse off for this forum and Newbies/FAQ's.

john
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Old 05-09-2004, 01:25 AM   #10
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No problems about reservations... if need be, I can clean out the post of between items when you are satisfied with the information you've got posted and answered from in between replies. Just ive me a PM and let me know.
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Old 05-09-2004, 10:53 AM   #11
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Quote:
b. An aftermarket intercooler with decreased pressure drop can decrease lag
I realize it's a FAQ, and is generalized, but you may want to mention here that any aftermarket intercooler with larger piping+core+endtank capacity than stock is going to increase turbo lag. It may be that the increase is offset by the reduction in pressure drop for the particular IC, but...

I think it would be worthwhile to clear up 'boost threshold' vs. 'turbo lag' as well. They're vastly different things and very often 'turbo lag' is used incorrectly to describe what is actually boost threshold.
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Old 05-09-2004, 04:33 PM   #12
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Very nice Unabomber. I sent you a couple things.

Keep up the good work. Unabomber for Newb Mod!
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Old 05-09-2004, 10:54 PM   #13
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My many thanks for the replies here. I updated the post with the replies here, and hope to start working on the replies to the other thread and my stuffed PM box tomorrow and the rest of this week. Lots of good feedback from "famous name" frequenters to the technical forums so far. It would be nice for a Vendor or tuner to chime in though.

I do appreciate the Moderator votes. I threw my hat into the ring a month or two ago, but never heard back. I assume Nick feels there is enough moderation in the technical forums already. Oh well, that means more time for FAQs and not worrying about moving threads, deleting threads, and all that other glamorous stuff mods do. Maybe good old 8Complex can put another word in for a brother.
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Old 05-10-2004, 11:06 AM   #14
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I have a question: How much horsepower/torque can one expect from port and polishing a stock turbo? By how many RPMs do you decrease the boost threshold (turbo lag) on a port and polished stock turbo?
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Old 05-10-2004, 11:13 AM   #15
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Quote:
Originally posted by NeoteriX
I have a question: How much horsepower/torque can one expect from port and polishing a stock turbo? By how many RPMs do you decrease the boost threshold (turbo lag) on a port and polished stock turbo?
A) Depends on how much you turn up the boost. Porting and polishing does not in its own right buy you ANY power. It will help spooling a very tiny amount.


B) 300-400RPM max on a TD04-13G stock turbo
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Old 05-10-2004, 11:29 AM   #16
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Things are really busy around here lately, but I just wanted to throw in a couple of thoughts on questions we are normally asked and ones that the author of this thread had brought up for us to address:

Quote:
1. What makes a good autocross turbo? (generally speaking)
The big thing to look for in a good performer for autocross use would be quick spool and more than stock flow. It is very hard to build a machine that will be effective not only for putting down huge dyno numbers but that will also be effective and usable on the autocross course. All areas have different courses. The area that we are located in uses mostly small, tight, technical courses that require 1st or 2nd gear mostly and low RPM's. A turbo that would perform well at a large sweeping course such as the Subaru Challenge last year at Laurens would not perform at all well in our local events here in NC, so there is one example of how someone might have to compromise on the level of build of their car, depending on what they want to do with it.

Quote:
2. What are good autocross turbos? (specific examples)
Aside from the TD04, the TD05-16G is a truly amazing upgrde turbo for the 2.0L, it spools amazingly quick, has a real "push you back in the seat" midragne pull, and a pretty impressive top end as well. In the midrange it can actually flow more air than a VF34, so it is a great choice for most autocross courses.

The VF34 is a good choice as well for most autocross sessions, giving great spoolup and very good midrange. Care should be taken with this turbo as it can be prone to boost creep.

The VF22 can perform well on medium size to large autocross courses. Although it is ball bearing its large F5 compressor wheel and #20 exhaust housing make it a bit slower to spool, but midrange and top end power are great!

A popular choice for autocross is the VF39 (yes, the STi factory turbo) It uses the F55 compressor wheel from the VF34 and a different version of the 18 exhaust housing. (I know there are lots of people saying it has a 17 housing but that is incorrect, I can take a pic if someone wants one ) The compressor housing has a bit smaller volume than the VF34. This one will spool well, slightly slower than the VF34, have almost identical midrange power, and nearly the same top end ability. Be VERY careful of boost creep with this one however due to the design of the exhaust housing and the wastegate.

We have recently witnessed a TD06-18G in action at our local events. Even though the courses are small, the 18G is spooling well enough to keep that car within the top 3 cars there. It spools well, has a HUGE midrange and great top end as well.

I am very happy that this thread came about, there is not enough good concrete information around about this subject for people to make an informed decision. We have talked with a lot of people that bought a turbo based on what they read in only one or two threads on this or other message boards. They didn't research enough but bought a turbo anyhow. A few months later they are unhappy and want to trade it in to us or want us to assist them in selling it to get something else.

If there is good information presented that is factual, not just "I heard that Turbo B uses housing C" it will be better for the entire community.

Unabomber, thanks for the heads up on this, let me know if we can help with anything, pics, etc.
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Old 05-10-2004, 12:34 PM   #17
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Quote:
Originally posted by Full_Clip
Holy crap.


Full_Clip votes unabomber for mod status.
damn straight!
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Old 05-10-2004, 12:42 PM   #18
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I think "autocross turbo" is a little misleading.. there is only really one class where people can take WRX's/STi's with upgraded turbos, and that's SM. Everyone in AS/DS/STX/STU/ESP is going to be on their stock turbo. Upgrading your turbo "for autocross" will put you in a class where you have to spend buckets of money to be competitive.. (or be a really awesome driver)

john
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Old 05-10-2004, 01:06 PM   #19
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So much good information! I wait a few hours and my work load swells even more. I hope to get a good couple of updating hours tonight to catch up.

Thanks a ton for chiming in Jerry! I will probably be leaning on your knowledge some more later, so stand by for a PM or two later.
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Old 05-10-2004, 01:27 PM   #20
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I feel special.

Once again great FAQ series. You should sell it to the newbs.
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Old 05-10-2004, 02:07 PM   #21
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Quote:
Originally posted by ButtDyno
I think "autocross turbo" is a little misleading.. there is only really one class where people can take WRX's/STi's with upgraded turbos, and that's SM. Everyone in AS/DS/STX/STU/ESP is going to be on their stock turbo. Upgrading your turbo "for autocross" will put you in a class where you have to spend buckets of money to be competitive.. (or be a really awesome driver)

john
Anybody planning on doing anything to their turbo that has talked with us, pretty much knows that they can't "legally" run anything except SM, FP, DP, EM, or some local only classes such as SMU in SC-SCCA.
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Old 05-10-2004, 02:15 PM   #22
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i''ve been researching this myself. Thanks Unabomber!
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Old 05-10-2004, 04:32 PM   #23
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Great thread! thanks for putting this info together.
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Old 05-10-2004, 05:34 PM   #24
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Quote:
Originally posted by ButtDyno
I think "autocross turbo" is a little misleading.. there is only really one class where people can take WRX's/STi's with upgraded turbos, and that's SM. Everyone in AS/DS/STX/STU/ESP is going to be on their stock turbo. Upgrading your turbo "for autocross" will put you in a class where you have to spend buckets of money to be competitive.. (or be a really awesome driver)

john
If you port and polish your turbo, does that bump you up into SM?
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Old 05-10-2004, 05:38 PM   #25
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Quote:
Originally posted by NeoteriX
If you port and polish your turbo, does that bump you up into SM?
Not allowed in ESP, so AFAIK yes..

john
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