TeamCapri
Tech, Repairs, Upgrades => Capri XR-2 89-94 => Topic started by: frog on February 21, 2017, 10:16:17 AM
-
Picked up a 93 xr2 couple of years ago did mods to it, chip, bubble top, manual boost control set 15 psi, lowering springs, double rear sway bar, struts and brake slotted, 2" exhaust, wheels and tires. just picked up a 91 n/a body in real good shape. 93 not so good. over summer will be smushing them together and come up with a 91 xr2. I have found a lot of good info on site. I will rebuild the xr2 motor and hopefully tranny with 5th gear and lim slip. I will be doing track nite in Rockford il. a lot of miatas need their attitude adjusted. ha ha. I will update as build goes on. If I have questions or get stuck I will reach out to ya'll. thanks for all the info.
-
Welcome to the team! Nice mods! Sounds like you'll test at Blackhawk Farms?
-
Yes went there last year and fell in love with road racing. besides everyone at work drives scca here so I join in fun. they drive porscha's and bimmer Just thought I would be different. :P
-
Sounds like a nice car. Be sure and keep us updated.
Jack Byrd
-
Last time I was at Blackhawk was in the early 90's. I watched my brother race his 86 Escort GT..
.
(https://s18.postimg.org/fmudiojbd/image.jpg)
(https://s18.postimg.org/y2eug355l/image.jpg)
-
The delimma I trying to figure out now is do I want to stay with a low compression and boost or high compression and boost. The car will most likely be a short track car 2nd, 3rd,and 4th gear mainly. short straits. I figure that the high comp. will be good for rolling out of a corner not on full boost this should help with keeping traction until the car settles out and full boost is ready and applied.. also the compression will help on down shifts into the corner. less brakes. I will keep boost at about 13 to 15 psi. any thoughts ? 8). I have two running and driving cars avialble for this combo. 2 into 1 should make for a nice ride
-
Your thinking parallels mine. It would seem to me that high compression, low boost would give the best performance on the street and the type of track you're talking about. Increasing the efficiency isn't as cheap and easy as twisting up the boost, but pays off on the bottom end and mid-range and doesn't strain the engine as much. Besides, on the street, where do you need the power. How much time do you spend at 6000RPM?
Jack Byrd
-
Bump for being relevant to my interests.
-
I was beer racing last nite in garage and relized something along these line. Every time I leave a stop lite and there is a car next to me I have to wait for the turbo to spool up to keep up with them after that no problem. but if I was running high compression the motor would not work as hard to make power at low/no boost. not that it takes long for ours to spool up. but that time is they are in front of me now I have to make up time. So yes !!!! it will be high compression and moderate boost for this car. besides saying 9.5 to 1 just plain sounds better than compression ratio of 7.2. Besides the girl told me that what she wants. gotta listen to her. lotta beer ha ha ::)
-
Very interested in your outcome as I've wanted to try this for years. Back in 1963 Chevrolet built the low compression Corvair Spyder and it ran really good but a couple of years later, they put four carburetors on a high compression engine. The N/A car could outrun the turbo to 60MPH easily. Oldsmobile on the other hand built a high compression engine with alky injection. That thing was a bear right off the line for 215CID. Had both including a hopped up Corvair and always loved that Olds. Rover used that engine for years after GM gave up on it although no turbo.
Jack Byrd
-
My thinking is I may lose some volume in the cylinder for the intake charge but if you compress it into a smaller tighter package it will have a bigger explosion and more on the down stroke. and off idle to spool up should provide more power on the low end. I will be able to use this to my advantage coming out of a turn. I am also going to be using a water/meth kit. set on a pressure switch to come in at 10 psi due to the volume of air the motor will need just for cooling purpose. or I could just blow the piston right out of the motor. that would be the BIG bang theory. If this works I think I will be very happy with the set up. will the suspension handle it don't know I will tackle that one later. ;D
-
The main reason the XR2 engine is such a ridiculously low compression is that they wanted the turbo engines to last - higher compression turbo setups are much more sensitive to the tune and gasoline octane/quality
I've built a high-compression turbo Capri for Russ - the result was lovely, with fantastic gas mileage to boot.
Do you need a water/meth injection setup? I have one I bought secondhand but missing the nozzle. I've never set it up, I'd be willing to sell it
-
is that the car he calls suparoo or something like that. the red one.
-
The main reason the XR2 engine is such a ridiculously low compression is that they wanted the turbo engines to last - higher compression turbo setups are much more sensitive to the tune and gasoline octane/quality
I've built a high-compression turbo Capri for Russ - the result was lovely, with fantastic gas mileage to boot.
Do you need a water/meth injection setup? I have one I bought secondhand but missing the nozzle. I've never set it up, I'd be willing to sell it
Great, I love the validation. That's exactly the results I was expecting. I expect a more advanced/tuneable ecu would be helpful.
Jack Byrd
-
will the suspension handle it don't know I will tackle that one later. ;D
If you're more interested in handling than top down motoring, check out Festivas. There is a guy on the Festiva Forum that had one that would outrun Corvettes. There used to be a Corvette vs Festiva video on Youtube showing Charlie on a Phoenix road course and the Corvette couldn't keep up with him. Charlie has a couple of Capris, but says the suspension isn't up he the power and can't be made to handle as well the Festiva.
Jack Byrd
-
Yes That would be fun to do BUT I like the top down rolling, and I have two capris and no festivas. so I will have fun rollin a capri made to run and have fun doing it. I really like the question what is that?. I already got started on the 91 she sat outside for a few years covered in leaves dirt bird poop. so I gave her a bath, broke out some rubbing compound, polisher and wax the old girl cleaned up nice not perfect. now just need to clean the inside and get rid of the trash and vacuume up. she will be a nice driver. until I start my swap. ;D
-
If your intrested in handling with a Capri pick up a hardtop. The hardtop drastically decreases body roll at the cost of weight. That can be accounted for with removing the soft-top, but doing so is a huge pain. Your main problem is going to be torque steer, the higher the horsepower you giverl the car the more its going to be a problem.
I myself am really intrested in high comp and boost, but I doubt ill ever experiment with it. Id like one day to do a twincharge setup but the lack of room makes it near impossible.
-
is that the car he calls suparoo or something like that. the red one.
The SuperRoo was a different project I helped him with.
The one I'm talking about we called "Antoinette" It was a blue 94. He ended up selling it a while back
We used a stock n/a engine from a manual capri (9.4:1 compression) with a stock VJ14 turbo and kept the boost reasonable
-
Okay I no the car. yea that was nice one. The one I pick up was his girlfriends blue one with the cloth top. body is in real good shape. just not enough motor. this is an automatic so it has 9.2 comp ratio correct. I do have a hard top. but am trying to figure out a actual roll hoop setup. this should stiffen the car and still let me run the drop top. the problem is I run the bubble top and I will not give that up it just makes the cars look to good. so my rear kiker bars are hard to place. I will work it out and go from there. I am trying to negate torque steer by using the lim slip set up, undecided about that. don't know how well this will work on a street car. kinda iffy locking the ster wheels together. OH and I found a fully working nitrous system while digging in my garage . wonder how this can work into this project. HA HA ;D