Ask the Car People.SM


Got an Upcoming Mod Project? Tell Us About It!

52 messages,  Last post on Jun 05, 2006 at 1:08 PM

You are in the Speed Shop Tuning and Modification Forum.

What is this discussion about? Performance Mods

Messages Page 3 of 6

#13 of 52 I hate this insistance on a title by fredmcmurray

Apr 07, 2005 (9:14 pm)

Legally, they are supposed to fail you for any aftermarket mods that don't have an expemption number, regardless of what the sniffer says but many shops aren't too diligent about that. That's why I suggested getting black hoses if possible. Anything that peaks a shop curiosity is bad.
You can ask for a pretest to check your emissions before doing the real run. I always do that with my MR2. Once I avoided having a "Gross Polluter" classification hung on my car by doing that. Once you have a GP label on the record, you have to go to the referee station to get it off. Downside is you'll have to pay for two tests each time.

#14 of 52 Title by fredmcmurray

Apr 07, 2005 (11:34 pm)

BTW, a wise man I know who has been around the car industry for decades has often advised people considering modifying their car that if you want a faster car, buy a faster car.
 
And I misread your earlier question. You wanted to know how you would know before you decided to pursue this whether it would pass the sniffer.
You'll probably have to rely on the outfit that makes that kit for their experience. I don't know enough about how 928s handle fueling and ignition at WOT, open loop conditions vs. partial throttle, closed loop conditions and how the system you are looking at affects that but generally, the smog test is run at light load, partial throttle, closed loop conditions so the engine essentially self tunes and the cat cleans up any off nominal output. I'd guess the sniffer test won't be a problem.

#15 of 52 Re: Title [fredmcmurray] by steve_ HOST

Apr 08, 2005 (7:15 am)

Replying to: fredmcmurray (Apr 07, 2005 11:34 pm)
if you want a faster car, buy a faster car
 
That makes a lot of sense to me, unless you really want to enjoy the hobby aspect of modding your ride. Gets expensive either way (hobbies seem to do that).
 
Btw, the title requirement is geared to forum improvements in the pipeline - we can't seem to stop modding around here either (and our speed has greatly improved just in the last six months!)
 
Steve, Host

#16 of 52 this and that... by Mr_Shiftright HOST

Apr 08, 2005 (9:47 am)

Well in general your remarks are all well taken but when you are dealing with very complex and exotic types of car, the situation changes a bit. Sometimes it is better to deal with a known entity. Fer instance, I know my car has a rebuilt 5-speed, new clutch, new synchros, new CV joints, new diff bearings, etc. Also I have an engine that burns no oil and has outstanding compression.
 
Now to sell that off and get "new 928 Mystery Car X" for double what my car is worth---well, a used 928 is not a car you want to have to rebuild. Also the newer 928s go to an interference-fit engine (which mine doesn't have) and higher compression. So then I'd have to run premium fuel and sweat a broken timing belt or change it out every 30K, which is expensive.
 
So there are plusses and minuses here. If I keep the old car, I save $250 a year on gas and maybe $600 a year on maintenance (easy).
 
As for performance, a newer 928 puts out 326HP and my car stock is I believe 231. So presuming a 35% increase in HP with this blower, I might hit around 310HP without much stress on the engine.
 
On the downside, I have the dreaded twin clutch disk, which grips like crazy but doesn't release quickly, making shifts a bit slow and clunky. But then I'm not drag racing.

#17 of 52 OR....I can go this route by Mr_Shiftright HOST

Apr 11, 2005 (5:18 pm)

This company sells a conversion kit to install a Corvette or Camaro LT-1 engine in my Porsche 928!
 
http://www.renegadehybrids.com/928.htm
 
Looks like by the time you buy everything you need it's about the same price down the road.

#18 of 52 That's what I was saying..... (!) by driftracer

Apr 11, 2005 (5:42 pm)

#19 of 52 pros and cons by Mr_Shiftright HOST

Apr 11, 2005 (7:00 pm)

Yeah but I need the conversion kit at $1,400, the clutch kit and options at another $1,400, a junkyard Lt-1 and all the accessories bolted to it for $2,500, then I need an aftermarket wiring harness to hook up the fuel injection and ECU, and then I need 30-40 hours labor.
 
And then I have a Porsche with a 350 Chevy in it rather than a supercharged stock motor that's all neat and tidy and costs the same.
 
If I SC the stock motor, I'll have more HP than a N/A stock LT-1 motor.
 
But of course, one can punch out the LT-1 motor to correct that for not a lot of money.

#20 of 52 Right - lots of HP by driftracer

Apr 12, 2005 (12:14 pm)

potential in an LT-1 - 383 stroker, induction, cam, heads, etc...

#21 of 52 yeah I know I know... by Mr_Shiftright HOST

Apr 12, 2005 (3:23 pm)

yes but then I have an animal car again which I don't want.
 
I want a sleeper. I want to leave a $60K sportscar in the dust like you see in the viewing screen on the starship Enterprise when they punch the warp button.
 
Oh, decisions, decisions...
 
right now it's tax time, and I'm watching my supercharger dissolve before my eyes....at least temporarily.
 
My friend Monty (you know, the one who blew up two C5 motors?) has a Porsche 914 with Corvette power. It's freaky-fast. He needed to flare it out all over to get a fit.
 

#22 of 52 LS1s and LT1s by driftracer

Apr 12, 2005 (3:47 pm)

can be installed and be VERY quiet.....great sleeper potential.
 
You don't have to follow me in the "I'm from Texas, I have to have loud Flowmasters" train of thought....

Messages Page 3 of 6

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