Oh man. How long is a piece of string? You can do a whole bunch of calculations based on how much airflow is required, and so forth.. But at the end of the day it really depends on what you want out of it.
Read the book... :) If you have a high compression ratio then your going to be fairly limited on the amount of boost you can run, but still you will want a turbo that can produce the amount of air required for the engine. If your stroking it, then I assume that you don't plan on making it rev very hard, so you will have to be very careful about what turbo you choose. You're going to want something small on the exhaust side, but with enough huff on the compressor to feed it, without making it surge. Plan on using an external wastegate on it and you'll be on the right track. T3/4 turbos are cheap but a GT30somthing is going to be much better, but there's a zillion combinations to choose from. Really, You will have to look at how much power you want from it first, where in the RPM range you want it, and what it's going to be used for. Your in a real dilemma mate, because you haven't even built this engine yet. If your going to run the turbo before it's stroked it's going to require a whole different setup to when it's stroked. If you are going to build the engine first, then select a turbo for it as the very last thing you do, make sure you have all the specs figured out beforehand, and ask some experts. I guarantee they'll all give you a completely different opinion on what turbo will suit it. The best thing you can do is what I told Rob, and that is to read those 2 books, do your own research and make up your own mind on what you want. Then you can't blame anyone can you. Learn to read a compressor flow map as well, because they can / will save you megabucks of trial and error blowups. -----Original Message----- From: Dan [mailto:[EMAIL PROTECTED] Sent: Friday, 16 September 2005 7:06 PM To: [email protected] Subject: Re: L18 EFI turbo in a 510 (T3 turbos) Hey Geordie, I have a custom made manifoldfor an inline 6 L series with a T3 flange on it, will be fitting it to an L28 with a P90 head (when I can find one hehe), eventually I'd be doing boring and stroking it out, evenually I want to create a 3.1 litre turbocharged engine out of it, I will probably turbocharge it before I do that though, I'll find a way to deal wit the compression ratios when I do it. Anyway, what are your thoughts on the turbocharger units and power it will make? Geordie wrote: > It really depends on how much power you want to make & how much lag > you will accept. > > A T25 will give good response, but will be limited in power output and > you won't want to go over 10psi with no intercooler or 15psi with > intercooler. > > T28 will be a smidge laggier, but if you get a ballbearing one then > that will offset the lagginess and give you good response like a T25 > without the flow restrictions. > > The exhaust side A/R in real basic terms is this: The bigger the > number the laggier it'll be, but with the benefit of more overall flow. > .48 is small and will choke it'self up in the high RPM range. > .64 is a nice middle size for 1.8 to 2lt engines. > .8 is getting on the big side of things. Probably not necessary unless > you start putting on big compressor housings and stuff. > > There are some real nice turbos and options in the T2x range, so you > don't need to really go changing to T3 flange unless you have to. > What i've found is that if you can switch up to T3 series of turbos > (change the flange on your manifold), there are some really nice > options available such as T3/4 hybrids that are dirt cheap and produce > some sickening amounts of power, not necessarily laggy either. > > I bought a T3/4 for my SR20det and it is running on 18psi, making some > really scary horsepower. On stock boost it made 215hp @ the wheels > while I was running the engine in. It's now run in and 18psi is just a > whole new dimension that I haven't experienced previously. It's fast, > and will bag up the tyres in 4th gear @ 140ish km/h. I haven't dyno'd > it at this boost level yet. For the record, the exhaust side is .48 T3 > housing which *I Think* equals something larger in the T2x series like > .6 to .8 ish. I might be wrong about that part tho. > > A turbo'd L 18-20 engine with similar turbo configuration could do the > same sorts of things. The T2x series of turbos are quite sufficient > though in most setups, so don't take me too literally. I just went to > T3 coz I had one sitting around, and then found a bigger & badder one > very cheap when the small one blew up. If you can, grab yourself a > disco-potato GT25RS and you will be set. These are apparantly the > ducks guts of ballbearing T2x turbos. > > I LOVE turbos. Cheap thrills to be had!!! > > > -----Original Message----- > *From:* Rob P [mailto:[EMAIL PROTECTED] > *Sent:* Friday, 16 September 2005 4:31 PM > *To:* [email protected] > *Subject:* L18 EFI turbo in a 510 > > Hi all, > I have in my sweaty palms a L18 EFI factory inlet manifold, A > turbo exhaust manifold (modified diesel log-type manifold from a > Navara Z-20 or something) a Microtech D5 Turbo EFI computer and I > want to find a suitable Turbocharger to suit an L18 or L20B motor. > It's for my 1972 Datsun 1600 and I don't want to do the usual > CA18DET, FJ20DET or SR20DET swap. I need a turbo with a T25 / T28 > flange to suit my exhaust manifold. My guess is a CA18DET or > SR20DET type turbo would be the best choice. I know bugger all > about turbos, so I need advice on the specs for A/R compressor > and exhaust housings. I notice there is a range of T25 and > T28 turbos available between .48 and .64 A/R. Does anyone know > which A/R I need for L20B and/or L18? > > Any advice at all would be appreciated, > > Cheers, > Rob > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [email protected] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[email protected]/ > > --------------------------------------------------------------------- > > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] Send > submissions to [email protected] No unauthorised > redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[email protected]/ > --------------------------------------------------------------------- > >----------------------------------------------------------------------- >- > >No virus found in this outgoing message. >Checked by AVG Anti-Virus. >Version: 7.0.344 / Virus Database: 267.11.0/103 - Release Date: >15/09/2005 > > -- No virus found in this incoming message. 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