My friend just got a 1986 vw gti 16v. He gave me a ride in it and it pulled harder then almost any other car I have been in. Dont worry, this isnt another "what can I do to beat this" thread. How big of a difference in pull will a port and polish give? I have ridden in a tii and I was in heaven. I know I will buy a tii down the road, but the only way I could right now is if I sell my GTU, and I dont think I will ever be able to. Will how hard a port and polished 13b pulls be comparable to that of a stock tii?

 

what are you going to be porting and polishing?

 

oh ... no

wow

I would just get a 13b stroker kit. Upgrades you to 1.6L

ibtl

 

porting/polishing intake/TB don't bother

opening motor to port and polish the internals.. buy a TII instead with the cash u just spent+the GTU

 

New camshafts FTW!

Seriously, you'd need a lot of porting to the intake ports (bridge, peripheral, street, j-bridge, etc...) to start making power upwards of what a TII would give you stock. You'd also have to tear down your motor to port it and you might as well rebuild it while you're at it. If you search for those port jobs on the forum i'm sure you can find out how much power you'll be making and how much it will cost.

 

Really? I didn't know I need a bridge to make the same power as a TII stock.

A cone filter with cold air ducting, full exhaust, and tune would give you the same power as a TII stock.

OP: This isn't GT, you can't port and polish the cylinder head of an RX-7. (Well, there are some exceptions, but lets not get into that.)

 

Get a ride in an FC turbo with a full exhaust and come back with yout findings...


-Ted

 

An NA with a reasonable condition engine and proper supporting mods (CAI w/ cone filter, full exhaust, aluminum flywheel, etc.) can at least keep up with a stock TII. With a fuel controller it would probably be faster. Of you could sell the car, put the money you would spend on that stuff into a TII and have a lot of room to grow.

 

I did ride in a turbo ii, (stock exhaust) and I was in heaven, it pulled harder then anything else ive ridden in (modded turbo mkiii supra). My intentions are to keep my GTU for the rest of my life (some of you might understand). I am planning on buying a tii with a blown engine and rebuilding it myself down the road, but I cant right now. I just wanted to know if I get it rebuilt, ported and polished by Atkins rotary, if the experience "pull" will be comparable to that of the tii.

 

It's NA, so while they may make the same amount of power after modification, it will never replicate the "pull" feeling (i.e. torque) of a turbo. You'll probably be going the same speed though.

 

You need to get a ride on one with a full exhaust.
If you thought the stock FC turbo was fast, an FC turbo with BPU will make you shat in your pants...


-Ted

 

Yea, with a ported NA, you may get the same peak hp as a TII, but the shape of the curve will be much different. Relatively stock TII's make peak torque at around 3-4k RPM, at which point the torque begins to taper down a bit to the max power at 5.5 - 6k. A properly ported NA with a tuned intake will have a much peakier torque band, probably pretty high in the RPM range, so you really wont get that "shove" until you reach that torque band, and then it wont last nearly as long.

 

with a proper tune, you won't get a short shove, but you'd feel like you're getting pushed for a very very long period of time.

 

TII > NA

/thread

 

Get a good full exhaust for your car and then streetport it perhaps, i'd imagine a GTU with those mods would be much faster than a 16v gti.

 

Wow some harsh responses for such a simple inquiry.

The short end is that while porting will increase your performance, a turbo, evena small one, is going to go a long way. A turbo will have few downsides to normal driving. Porting however does affect part throttle levels, emissions, etc... The more extreme porting styles that allow you to make more power have even more street driven compromises. A really nicely setup turbo system on stock ports can outdo the best peripheral ported nonturbo engines with none of the drawbacks.

You can get an n/a as fast as a stock TII and still maintain a relative amount of streetability. However it'll cost you some good money. You wouldn't need a bridgeport but you would need a nice exhaust system, streetporting, perhaps a lightweight flywheel, and a few other misc things. This costs money and the powerband still isn't anything like that of a turbo engine. You will lack torque by comparison and will need to rev it up higher to get moving quickly. A stock TII really has no reason to go over about 6500 rpm or so and it's plenty quick up to that point. They feel totally different. Keep in mind as has been stated already, if you installed a free flowing exhaust system on a TII, power really goes up and the n/a won't stand a chance.

If you are looking for the acceleration of a completely stock TII and are happy with this, then yes it is possible to do with an n/a. It won't feel the same though. With a TII, if you ever want more power, it's very easy to get. With an n/a if you want more power, it's another engine rebuild with more extreme porting with more compromises and more money spent. A turbo is really hard to beat dollar for hp wise when it comes to performance.

 

it depends on the gti's mods but with a good port job and and exhaust u should be able to beat a 16v it wont feel the same "pull" wise but u could beat it

 

You're right, I just got done reading your thread up in the 1/4 mile section. Nice work! I'm gonna go back and read it again.

 

so bottom line, I should do all of the minor mods that are covered under the beefy n/a thread besides port and polish until I have the money for a tii swap.

Would you recommend buying a tii with a blown engine and salvaging all of the parts and getting it rebuilt by atkins or buy a jdm/rebuilt/used engine and installing that and slowly swapping all the other parts out (like the rear end, transition etc)